Wave Optics

154 questions · Physics · JEE Main

Wave Optics

154 questions · Physics · JEE Main

A light wave is propagating with plane wave fronts of the type $x + y + z =$ constant. Th angle made by the direction of wave propagation with the $x$ -axis is :2025 · 2 Apr · Shift 1 · Q57 · MCQ
If the measured angular separation between the second minimum to the left of the central maximum and the third minimum to the right of the central maximum is $3 0^{\circ}$ in a single slit diffraction pattern recorded using 628 nm light,…2025 · 2 Apr · Shift 1 · Q74 · Numerical
Two coherent monochromatic light beams of intensities 4I and 9I are superimposed. The difference between the maximum and minimum intensities in the resulting interference pattern is $x I$ . The value of $x$ is …2025 · 3 Apr · Shift 1 · Q73 · Numerical
Two monochromatic light beams have intensities in the ratio 1:9. An interference pattern is obtained by these beams. The ratio of the intensities of maximum to minimum is2025 · 3 Apr · Shift 2 · Q52 · MCQ
Width of one of the two slits in a Young's double slit interference experiment is half of the other slit. The ratio of the maximum to the minimum intensity in the interference pattern is :2025 · 3 Apr · Shift 2 · Q57 · MCQ
A monochromatic light of frequency $5 \times 1 0^{14} Hz$ travelling through air, is incident on a medium of refractive index ' 2 '. Wavelength of the refracted light will be :2025 · 3 Apr · Shift 2 · Q63 · MCQ
In a Young's double slit experiment, the slits are separated by 0.2 mm . If the slits separation is increased to 0.4 mm , the percentage change of the fringe width is :2025 · 4 Apr · Shift 1 · Q54 · MCQ
Two polarisers $P_{1}$ and $P_{2}$ are placed in such a way that the intensity of the transmitted light will be zero. A third polariser $P_{3}$ is inserted in between $P_{1}$ and $P_{2}$ , at particular angle between $P_{2}$ and $P_{3}$ . The transmitted…2025 · 4 Apr · Shift 2 · Q65 · MCQ
In a Young's double slit experiment, two slits are located 1.5 mm apart. The distance of screen from slits is 2 m and the wavelength of the source is 400 nm . If the 20 maxima of the double slit pattern are contained within the central…2025 · 4 Apr · Shift 2 · Q75 · Numerical
Two plane polarized light waves combine at a certain point whose electric field components are $E_{1} = E_{0} Sin ω t E_{2} = E_{0} Sin (ω t + \frac{π}{3})$ …2025 · 7 Apr · Shift 1 · Q60 · MCQ
In a Young's double slit experiment, the source is white light. One of the slits is covered by red filter and another by a green filter. In this case:2025 · 8 Apr · Shift 2 · Q70 · MCQ
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion-(A) : If Young's double slit experiment is performed in an optically denser medium than air, then the consecutive fringes…2025 · 22 Jan · Shift 1 · Q68 · MCQ
A transparent film of refractive index, 2.0 is coated on a glass slab of refractive index, 1.45. What is the minimum thickness of transparent film to be coated for the maximum transmission of Green light of wavelength 550 nm . [Assume that…2025 · 22 Jan · Shift 2 · Q64 · MCQ
Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : In Young's double slit experiment, the fringes produced by red light are closer as compared to those produced by blue…2025 · 22 Jan · Shift 2 · Q67 · MCQ
The width of one of the two slits in Young's double slit experiment is d while that of the other slit is $x d$ . If the ratio of the maximum to the minimum intensity in the interference pattern on the screen is $9 : 4$ then what is…2025 · 23 Jan · Shift 2 · Q62 · MCQ
The Young's double slit interference experiment is performed using light consisting of 480 nm and 600 nm wavelengths to form interference patterns. The least number of the bright fringes of 480 nm light that are required for the first…2025 · 24 Jan · Shift 1 · Q52 · MCQ
In a Young's double slit experiment, three polarizers are kept as shown in the figure. The transmission axes of $P_{1}$ and $P_{2}$ are orthogonal to each other. The polarizer $P_{3}$ covers both the slits with its transmission axis at $4 5^{\circ}$ … Includes diagram2025 · 24 Jan · Shift 2 · Q52 · MCQ
Young's double slit inteference apparatus is immersed in a liquid of refractive index 1.44. It has slit separation of 1.5 mm . The slits are illuminated by a parallel beam of light whose wavelength in air is 690 nm . The fringe-width on a…2025 · 24 Jan · Shift 2 · Q65 · MCQ
A double slit interference experiment performed with a light of wavelength 600 nm forms an interference fringe pattern on a screen with 10 th bright fringe having its centre at a distance of 10 mm from the central maximum. Distance of the…2025 · 28 Jan · Shift 1 · Q75 · Numerical
A thin transparent film with refractive index 1.4 , is held on circular ring of radius 1.8 cm . The fluid in the film evaporates such that transmission through the film at wavelength 560 nm goes to a minimum every 12 seconds. Assuming that…2025 · 28 Jan · Shift 2 · Q71 · Numerical
At the interface between two materials having refractive indices $n_{1}$ and $n_{2}$ , the critical angle for reflection of an em wave is $θ_{1 C}$ . The $n_{2}$ material is replaced by another material having refractive index $n_{3}$ …2025 · 29 Jan · Shift 1 · Q73 · MCQ
A monochromatic light of wavelength $6000 \overset{˚}{A}$ is incident on the single slit of width $0.01 mm$ . If the diffraction pattern is formed at the focus of the convex lens of focal length $20 cm$ , the linear width…2024 · 1 Feb · Shift 1 · Q66 · MCQ
A microwave of wavelength $2.0 cm$ falls normally on a slit of width $4.0 cm$ . The angular spread of the central maxima of the diffraction pattern obtained on a screen $1.5 m$ away from the slit, will be :2024 · 1 Feb · Shift 2 · Q73 · MCQ
In Young's double slit experiment, monochromatic light of wavelength 5000 Å is used. The slits are $1.0 mm$ apart and screen is placed at $1.0 m$ away from slits. The distance from the centre of the screen where…2024 · 1 Feb · Shift 2 · Q87 · Numerical
Two wavelengths $λ_{1}$ and $λ_{2}$ are used in Young's double slit experiment. $λ_{1} = 450 nm$ and $λ_{2} = 650 nm$ . The minimum order of fringe produced by $λ_{2}$ which overlaps with the fringe…2024 · 4 Apr · Shift 1 · Q90 · Numerical
The width of one of the two slits in a Young's double slit experiment is 4 times that of the other slit. The ratio of the maximum of the minimum intensity in the interference pattern is:2024 · 4 Apr · Shift 2 · Q73 · MCQ
Light emerges out of a convex lens when a source of light kept at its focus. The shape of wavefront of the light is :2024 · 5 Apr · Shift 1 · Q75 · MCQ
In Young's double slit experiment, carried out with light of wavelength $5000 A o$ , the distance between the slits is $0.3 mm$ and the screen is at $200 cm$ from the slits. The central maximum is at $x = 0 cm$ …2024 · 5 Apr · Shift 1 · Q89 · Numerical
Given below are two statements : Statement I : When the white light passed through a prism, the red light bends lesser than yellow and violet. Statement II : The refractive indices are different for different wavelengths in dispersive…2024 · 5 Apr · Shift 2 · Q70 · MCQ
In a single slit experiment, a parallel beam of green light of wavelength $550 nm$ passes through a slit of width $0.20 mm$ . The transmitted light is collected on a screen $100 cm$ away. The distance of first…2024 · 5 Apr · Shift 2 · Q83 · Numerical
Two coherent monochromatic light beams of intensities I and $4 I$ are superimposed. The difference between maximum and minimum possible intensities in the resulting beam is $x I$ . The value of $x$ is …2024 · 6 Apr · Shift 2 · Q86 · Numerical
A parallel beam of monochromatic light of wavelength $600 nm$ passes through single slit of $0.4 mm$ width. Angular divergence corresponding to second order minima would be $\times 1 0^{- 3} rad$ …2024 · 8 Apr · Shift 1 · Q88 · Numerical
Two slits are $1 mm$ apart and the screen is located $1 m$ away from the slits. A light of wavelength $500 nm$ is used. The width of each slit to obtain 10 maxima of the double slit pattern within the central…2024 · 8 Apr · Shift 2 · Q83 · Numerical
In a Young's double slit experiment, the intensity at a point is $(\frac{1}{4})^{th}$ of the maximum intensity, the minimum distance of the point from the central maximum is $μ m$ .…2024 · 9 Apr · Shift 1 · Q83 · Numerical
Monochromatic light of wavelength $500 nm$ is used in Young's double slit experiment. An interference pattern is obtained on a screen. When one of the slits is covered with a very thin glass plate (refractive index $= 1.5$ ), the…2024 · 9 Apr · Shift 2 · Q89 · Numerical
When a polaroid sheet is rotated between two crossed polaroids then the transmitted light intensity will be maximum for a rotation of :2024 · 27 Jan · Shift 2 · Q75 · MCQ
A parallel beam of monochromatic light of wavelength 5000 $A o$ is incident normally on a single narrow slit of width $0.001 mm$ . The light is focused by convex lens on screen, placed on its focal plane. The first…2024 · 27 Jan · Shift 2 · Q88 · Numerical
In a double slit experiment shown in figure, when light of wavelength $400 nm$ is used, dark fringe is observed at $P$ . If $D = 0.2 m$ , the minimum distance between the slits $S_{1}$ and $S_{2}$ is … Includes diagram2024 · 29 Jan · Shift 1 · Q81 · Numerical
In Young's double slit experiment, light from two identical sources are superimposing on a screen. The path difference between the two lights reaching at a point on the screen is $7 λ /4$ . The ratio of intensity of fringe at this…2024 · 29 Jan · Shift 2 · Q77 · MCQ
In a single slit diffraction pattern, a light of wavelength 6000 $A o$ is used. The distance between the first and third minima in the diffraction pattern is found to be $3 mm$ when the screen in placed $50 cm$ …2024 · 29 Jan · Shift 2 · Q83 · Numerical
The diffraction pattern of a light of wavelength $400 nm$ diffracting from a slit of width $0.2 mm$ is focused on the focal plane of a convex lens of focal length $100 cm$ . The width of the $1^{st}$ …2024 · 30 Jan · Shift 1 · Q65 · MCQ
A beam of unpolarised light of intensity $I_{0}$ is passed through a polaroid $A$ and then through another polaroid $B$ which is oriented so that its principal plane makes an angle of $4 5^{\circ}$ relative to that of $A$ . The intensity of…2024 · 30 Jan · Shift 2 · Q72 · MCQ
Two waves of intensity ratio $1 : 9$ cross each other at a point. The resultant intensities at that point, when (a) Waves are incoherent is $I_{1}$ (b) Waves are coherent is $I_{2}$ and differ in phase by $6 0^{\circ}$ . If $\frac{I _{1}}{I _{2}} = \frac{10}{x}$ …2024 · 31 Jan · Shift 1 · Q90 · Numerical
When unpolarized light is incident at an angle of $6 0^{\circ}$ on a transparent medium from air, the reflected ray is completely polarized. The angle of refraction in the medium is:2024 · 31 Jan · Shift 2 · Q74 · MCQ
' $n$ ' polarizing sheets are arranged such that each makes an angle $4 5^{\circ}$ with the preceeding sheet. An unpolarized light of intensity I is incident into this arrangement. The output intensity is found to be $I /64$ . The value of…2023 · 1 Feb · Shift 1 · Q45 · MCQ
As shown in the figure, in Young's double slit experiment, a thin plate of thickness $t = 10 μ m$ and refractive index $μ = 1.2$ is inserted infront of slit $S_{1}$ . The experiment is conducted in air $(μ = 1)$ and uses a… Includes diagram2023 · 1 Feb · Shift 2 · Q67 · Numerical
A beam of light consisting of two wavelengths $7000 A o$ and $5500 A o$ is used to obtain interference pattern in Young's double slit experiment. The distance between the slits is $2.5 mm$ and the…2023 · 6 Apr · Shift 2 · Q73 · Numerical
The width of fringe is $2 mm$ on the screen in a double slits experiment for the light of wavelength of $400 nm$ . The width of the fringe for the light of wavelength 600 $nm$ will be:2023 · 8 Apr · Shift 2 · Q56 · MCQ
Unpolarised light of intensity 32 Wm $^{- 2}$ passes through the combination of three polaroids such that the pass axis of the last polaroid is perpendicular to that of the pass axis of first polaroid. If intensity of emerging light is 3 Wm…2023 · 10 Apr · Shift 1 · Q70 · Numerical
The ratio of intensities at two points $P$ and $Q$ on the screen in a Young's double slit experiment where phase difference between two waves of same amplitude are $π /3$ and $π /2$ , respectively are2023 · 10 Apr · Shift 2 · Q51 · MCQ
In a Young's double slits experiment, the ratio of amplitude of light coming from slits is $2 : 1$ . The ratio of the maximum to minimum intensity in the interference pattern is:2023 · 13 Apr · Shift 2 · Q53 · MCQ
A single slit of width $a$ is illuminated by a monochromatic light of wavelength $600 nm$ . The value of ' $a$ ' for which first minimum appears at $θ = 3 0^{\circ}$ on the screen will be :2023 · 15 Apr · Shift 1 · Q52 · MCQ
Given below are two statements : Statement I : If the Brewster's angle for the light propagating from air to glass is $θ_{B}$ , then the Brewster's angle for the light propagating from glass to air is $\frac{π}{2} - θ_{B}$ …2023 · 24 Jan · Shift 1 · Q47 · MCQ
In Young's double slits experiment, the position of 5 $^{th}$ bright fringe from the central maximum is 5 cm. The distance between slits and screen is 1 m and wavelength of used monochromatic light is 600 nm. The separation…2023 · 25 Jan · Shift 1 · Q52 · MCQ
In a Young's double slit experiment, two slits are illuminated with a light of wavelength $800 nm$ . The line joining $A_{1} P$ is perpendicular to $A_{1} A_{2}$ as shown in the figure. If the first minimum is detected at $P$ , the… Includes diagram2023 · 29 Jan · Shift 1 · Q60 · MCQ
As shown in the figure, three identical polaroids P $_{1}$ , P $_{2}$ and P $_{3}$ are placed one after another. The pass axis of P $_{2}$ and P $_{3}$ are inclined at angle of 60 $^{\circ}$ and 90 $^{\circ}$ with respect to axis of P $_{1}$ . The source S… Includes diagram2023 · 29 Jan · Shift 1 · Q70 · Numerical
Unpolarised light is incident on the boundary between two dielectric media, whose dielectric constants are 2.8 (medium $- 1$ ) and 6.8 (medium $- 2$ ), respectively. To satisfy the condition, so that the reflected and refracted rays are…2023 · 29 Jan · Shift 2 · Q68 · Numerical
In Young's double slit experiment, two slits $S_{1}$ and $S_{2}$ are ' $d$ ' distance apart and the separation from slits to screen is $D$ (as shown in figure). Now if two transparent slabs of equal thickness $0.1 mm$ but… Includes diagram2023 · 30 Jan · Shift 1 · Q62 · Numerical
In a Young's double slit experiment, the intensities at two points, for the path differences $\frac{λ}{4}$ and $\frac{λ}{3}$ ( $λ$ being the wavelength of light used) are $I_{1}$ and $I_{2}$ respectively. If $I_{0}$ denotes…2023 · 30 Jan · Shift 2 · Q64 · Numerical
Two polaroide $A$ and $B$ are placed in such a way that the pass-axis of polaroids are perpendicular to each other. Now, another polaroid $C$ is placed between $A$ and $B$ bisecting angle…2023 · 31 Jan · Shift 1 · Q56 · MCQ
Two light waves of wavelengths 800 and $600 nm$ are used in Young's double slit experiment to obtain interference fringes on a screen placed $7 m$ away from plane of slits. If the two slits are separated by $0.35 mm$ …2023 · 31 Jan · Shift 2 · Q65 · Numerical
Sodium light of wavelengths 650 nm and 655 nm is used to study diffraction at a single slit of aperture 0.5 mm. The distance between the slit and the screen is 2.0 m. The separation between the positions of the first maxima of diffraction…2022 · 24 Jun · Shift 1 · Q65 · Numerical
Two light beams of intensities in the ratio of 9 : 4 are allowed to interfere. The ratio of the intensity of maxima and minima will be :2022 · 24 Jun · Shift 2 · Q63 · MCQ
The two light beams having intensities I and 9I interfere to produce a fringe pattern on a screen. The phase difference between the beams is $π$ /2 at point P and $π$ at point Q. Then the difference between the resultant intensities at…2022 · 25 Jun · Shift 1 · Q56 · MCQ
The interference pattern is obtained with two coherent light sources of intensity ratio 4 : 1. And the ratio $\frac{I _{m a x} + I _{m i n}}{I _{m a x} - I _{m i n}}$ is $\frac{5}{x}$ . Then, the value of x will be equal to :2022 · 25 Jun · Shift 2 · Q59 · MCQ
A light whose electric field vectors are completely removed by using a good polaroid, allowed to incident on the surface of the prism at Brewster's angle. Choose the most suitable option for the phenomenon related to the prism.2022 · 25 Jun · Shift 2 · Q60 · MCQ
In Young's double slit experiment, the fringe width is $12 mm$ . If the entire arrangement is placed in water of refractive index $\frac{4}{3}$ , then the fringe width becomes (in mm):2022 · 26 Jul · Shift 1 · Q48 · MCQ
For a specific wavelength 670 nm of light coming from a galaxy moving with velocity v, the observed wavelength is 670.7 nm. The value of v is :2022 · 26 Jun · Shift 2 · Q62 · MCQ
Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase difference between the two beams are $π /2$ and $π /3$ at points $A$ and $B$ respectively. The difference…2022 · 27 Jul · Shift 1 · Q65 · Numerical
Two coherent sources of light interfere. The intensity ratio of two sources is $1 : 4$ . For this interference pattern if the value of $\frac{I _{m a x} + I _{m i n}}{I _{m a x} - I _{m i n}}$ is equal to $\frac{2 α + 1}{β + 3}$ , then $\frac{α}{β}$ …2022 · 27 Jul · Shift 2 · Q54 · MCQ
In Young's double slit experiment the two slits are 0.6 mm distance apart. Interference pattern is observed on a screen at a distance 80 cm from the slits. The first dark fringe is observed on the screen directly opposite to one of the…2022 · 27 Jun · Shift 1 · Q62 · Numerical
In a Young's double slit experiment, a laser light of 560 nm produces an interference pattern with consecutive bright fringes' separation of 7.2 mm. Now another light is used to produce an interference pattern with consecutive bright…2022 · 28 Jul · Shift 1 · Q65 · Numerical
In Young's double slit experiment performed using a monochromatic light of wavelength $λ$ , when a glass plate ( $μ$ = 1.5) of thickness x $λ$ is introduced in the path of the one of the interfering beams, the intensity at the…2022 · 28 Jun · Shift 2 · Q65 · MCQ
In a Young's double slit experiment, an angular width of the fringe is 0.35 $^{\circ}$ on a screen placed at 2 m away for particular wavelength of 450 nm. The angular width of the fringe, when whole system is immersed in a medium of…2022 · 28 Jun · Shift 2 · Q70 · Numerical
Two light beams of intensities 4I and 9I interfere on a screen. The phase difference between these beams on the screen at point A is zero and at point B is $π$ . The difference of resultant intensities, at the point A and B, will be …2022 · 29 Jul · Shift 1 · Q73 · Numerical
An unpolarised light beam of intensity $2 I_{0}$ is passed through a polaroid P and then through another polaroid Q which is oriented in such a way that its passing axis makes an angle of $3 0^{\circ}$ relative to that of P. The intensity…2022 · 29 Jul · Shift 2 · Q52 · MCQ
Using Young's double slit experiment, a monochromatic light of wavelength 5000 $A o$ produces fringes of fringe width 0.5 mm. If another monochromatic light of wavelength 6000 $A o$ is used and the separation…2022 · 29 Jun · Shift 1 · Q58 · MCQ
In a double slit experiment with monochromatic light, fringes are obtained on a screen placed at some distance from the plane of slits. If the screen is moved by 5 $\times$ 10 $-$ 2 m towards the slits, the change in fringe width is 3 $\times$ …2022 · 29 Jun · Shift 2 · Q69 · Numerical
Find the ratio of maximum intensity to the minimum intensity in the interference pattern if the widths of the two slits in Young's experiment are in the ratio of 9 : 16. (Assuming intensity of light is directly proportional to the width of…2022 · 30 Jun · Shift 1 · Q57 · MCQ
The width of one of the two slits in a Young's double slit experiment is three times the other slit. If the amplitude of the light coming from a slit is proportional to the slit-width, the ratio of minimum to maximum intensity in the…2021 · 1 Sep · Shift 2 · Q67 · Numerical
A fringe width of 6 mm was produced for two slits separated by 1 mm apart. The screen is placed 10 m away. The wavelength of light used is 'x' nm. The value of 'x' to the nearest integer is .2021 · 16 Mar · Shift 1 · Q63 · Numerical
In Young's double slit arrangement, slits are separated by a gap of 0.5 mm, and the screen is placed at a distance of 0.5 m from them. The distance between the first and the third bright fringe formed when the slits are illuminated by a…2021 · 18 Mar · Shift 1 · Q53 · MCQ
A galaxy is moving away from the earth at a speed of 286 kms $-$ 1. The shift in the wavelength of a redline at 630 nm is x $\times$ 10 $-$ 10 m. The value of x, to the nearest integer, is . [Take the value of…2021 · 18 Mar · Shift 2 · Q63 · Numerical
With what speed should a galaxy move outward with respect to earth so that the sodium-D line at wavelength 5890 $A o$ is observed at 5896 $A o$ ?2021 · 20 Jul · Shift 2 · Q49 · MCQ
In a Young's double slit experiment, the width of the one of the slit is three times the other slit. The amplitude of the light coming from a slit is proportional to the slit-width. Find the ratio of the maximum to the minimum intensity in…2021 · 24 Feb · Shift 1 · Q53 · MCQ
An unpolarised light beam is incident on the polarizer of a polarization experiment and the intensity of light beam emerging from the analyzer is measured as 100 Lumens. Now, if the analyzer is rotated around the horizontal axis (direction…2021 · 24 Feb · Shift 1 · Q63 · Numerical
If the source of light used in a Young's double slit experiment is changed from red to violet :2021 · 24 Feb · Shift 2 · Q43 · MCQ
Two coherent light sources having intensity in the ratio 2x produce an interference pattern. The ratio $\frac{I _{m a x} - I _{m i n}}{I _{m a x} + I _{m i n}}$ will be :2021 · 25 Feb · Shift 1 · Q53 · MCQ
Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter 0.1 $μ$ m. If the diameter of the pinhole is slightly increased, it will affect the diffraction pattern such that:2021 · 25 Feb · Shift 2 · Q53 · MCQ
In the Young's double slit experiment, the distance between the slits varies in time as d(t) = d0 + a0 sin $ω$ t; where d0, $ω$ and a0 are constants. The difference between the largest fringe width and the smallest fringe width…2021 · 25 Jul · Shift 1 · Q57 · MCQ
White light is passed through a double slit and interference is observed on a screen 1.5 m away. The separation between the slits is 0.3 mm. The first violet and red fringes are formed 2.0 mm and 3.5 mm away from the central white fringes.…2021 · 26 Aug · Shift 1 · Q69 · Numerical
A source of light is placed in front of a screen. Intensity of light on the screen is I. Two Polaroids P1 and P2 are so placed in between the source of light and screen that the intensity of light on screen is I/2. P2 should be rotated by…2021 · 26 Aug · Shift 2 · Q64 · Numerical
In a Young's double slit experiment two slits are separated by 2 mm and the screen is placed one meter away. When a light of wavelength 500 nm is used, the fringe separation will be :2021 · 26 Feb · Shift 1 · Q50 · MCQ
The light waves from two coherent sources have same intensity I1 = I2 = I0. In interference pattern the intensity of light at minima is zero. What will be the intensity of light at maxima?2021 · 27 Aug · Shift 2 · Q57 · MCQ
In Young's double slit experiment, if the source of light changes from orange to blue then :2021 · 27 Jul · Shift 1 · Q56 · MCQ
The difference in the number of waves when yellow light propagates through air and vacuum columns of the same thickness is one. The thickness of the air column is mm. [Refractive index of air = 1.0003, wavelength…2021 · 27 Jul · Shift 2 · Q64 · Numerical
In a Young's double slit experiment, the slits are separated by 0.3 mm and the screen is 1.5 m away from the plane of slits. Distance between fourth bright fringes on both sides of central bright is 2.4 cm. The frequency of light used is $\times$ …2021 · 31 Aug · Shift 2 · Q66 · Numerical
Interference fringes are observed on a screen by illuminating two thin slits 1 mm apart with a light source ( $λ$ = 632.8 nm). The distance between the screen and the slits is 100 cm. If a bright fringe is observed on a screen at a…2020 · 2 Sep · Shift 1 · Q52 · MCQ
In a Young’s double slit experiment, 16 fringes are observed in a certain segment of the screen when light of a wavelength 700 nm is used. If the wavelength of light is changed to 400 nm, the number of fringes observed in the same segment…2020 · 2 Sep · Shift 2 · Q59 · MCQ
In a Young’s double slit experiment, light of 500 nm is used to produce an interference pattern. When the distance between the slits is 0.05 mm, the angular width (in degree) of the fringes formed on the distance screen is close to2020 · 3 Sep · Shift 1 · Q50 · MCQ
Two light waves having the same wavelength $λ$ in vacuum are in phase initially. Then the first wave travels a path L1 through a medium of refractive index n1 while the second wave travels a path of length L2 through a medium of…2020 · 3 Sep · Shift 2 · Q47 · MCQ
A beam of plane polarised light of large cross-sectional area and uniform intensity of 3.3 Wm-2 falls normally on a polariser (cross sectional area 3 $\times$ 10-4 m2) which rotates about its axis with an angular speed of 31.4 rad/s. The…2020 · 4 Sep · Shift 1 · Q57 · MCQ
Orange light of wavelength 6000 $\times$ 10–10 m illuminates a single slit of width 0.6 $\times$ 10–4 m. The maximum possible number of diffraction minima produced on both sides of the central maximum is .2020 · 4 Sep · Shift 2 · Q43 · Numerical
Two coherent sources of sound, S1 and S2, produce sound waves of the same wavelength, $λ$ = 1 m, in phase. S1 and S2 are placed 1.5 m apart (see fig). A listener, located at L, directly in front of S2 finds that the intensity is at a… Includes diagram2020 · 5 Sep · Shift 2 · Q38 · MCQ
In the figure below, P and Q are two equally intense coherent sources emitting radiation of wavelength 20 m. The separation between P and Q is 5 m and the phase of P is ahead of that of Q by 90o. A, B and C are three distinct points of… Includes diagram2020 · 6 Sep · Shift 1 · Q46 · MCQ
A Young's double-slit experiment is performed using monochromatic light of wavelength $λ$ . The intensity of light at a point on the screen, where the path difference is $λ$ , is K units. The intensity of light at a point where…2020 · 6 Sep · Shift 2 · Q50 · Numerical
A polarizer - analyser set is adjusted such that the intensity of light coming out of the analyser is just 10% of the original intensity. Assuming that the polarizer - analyser set does not absorb any light, the angle by which the analyser…2020 · 7 Jan · Shift 1 · Q60 · MCQ
Visible light of wavelength 6000 $\times$ 10-8 cm falls normally on a single slit and produces a diffraction pattern. It is found that the second diffraction minimum is at 60o from the central maximum. If the first minimum is produced at $θ$ …2020 · 7 Jan · Shift 1 · Q64 · MCQ
In a Young's double slit experiment, the separation between the slits is 0.15 mm. in the experiment, a source of light of wavelengh 589 nm is used and the interference pattern is observed on a screen kept 1.5 m away. The separation between…2020 · 7 Jan · Shift 2 · Q47 · MCQ
In a double slit experiment, at a certain point on the screen the path difference between the two interfering waves is $\frac{1}{8}$ th of a wavelength. The ratio of the intensity of light at that point to that at the centre of a bright…2020 · 8 Jan · Shift 2 · Q54 · MCQ
In a Young's double slit experiment 15 fringes are observed on a small portion of the screen when light of wavelength 500 nm is used. Ten fringes are observed on the same section of the screen when another light source of wavelength $λ$ …2020 · 9 Jan · Shift 2 · Q43 · Numerical
In an interference experiment the ratio of amplitudes of coherent waves is $\frac{a _{1}}{a _{2}} = \frac{1}{3}$ . The ratio of maximum and minimum intensities of fringes will be :2019 · 8 Apr · Shift 1 · Q49 · MCQ
Calculate the limit of resolution of a telescope objective having a diameter of 200 cm, if it has to detect light of wavelength 500 nm coming from a star :-2019 · 8 Apr · Shift 2 · Q71 · MCQ
The figure shows a Young's double slit experimental setup. It is observed that when a thin transparent sheet of thickness t and refractive index μ is put in front of one of the slits, the central maximum gest shifted by a distance equal to… Includes diagram2019 · 9 Apr · Shift 1 · Q56 · MCQ
Diameter of the objective lens of a telescope is 250 cm. For light of wavelength 600nm. coming from a distant object, the limit of resolution of the telescope is close to :-2019 · 9 Apr · Shift 2 · Q61 · MCQ
Consider a tank made of glass(refractive index 1.5) with a thick bottom. It is filled with a liquid of refractive index $μ$ . A student finds that, irrespective of what the incident angle i (see figure) is for a beam of light entering the… Includes diagram2019 · 9 Jan · Shift 1 · Q60 · MCQ
Two coherent sources produce waves of different intensities which interfere. After interference, the ratio of the maximum intensity to the minimum intensity is 16. The intensity of the waves are in the ratio :2019 · 9 Jan · Shift 1 · Q66 · MCQ
In a Young's double slit experiment, the slits are placed 0.320 mm apart. Light of wavelength $λ$ = 500 nm is incident on the slits. The total number of bright fringes that are observed in the angular range $-$ 30o $\leq θ \leq$ …2019 · 9 Jan · Shift 2 · Q60 · MCQ
In a Young's double slit experiment, the ratio of the slit's width is 4 : 1. The ratio of the intensity of maxima to minima, close to the central fringe on the screen, will be :2019 · 10 Apr · Shift 2 · Q52 · MCQ
In a Young’s double slit experiment with slit separation 0.1 mm, one observes a bright fringe at angle $\frac{1}{40}$ by using light of wavelength $λ$ 1. When the light of wavelength $λ$ 2 is used a bright fringe is seen at…2019 · 10 Jan · Shift 1 · Q57 · MCQ
Consider a Young’s double slit experiment as shown in figure. What should be the slit separation d in terms of wavelength $λ$ such that the first minima occurs directly in front of the slit (S1) ? Includes diagram2019 · 10 Jan · Shift 2 · Q52 · MCQ
In a Young's double slit experiment, the path difference, at a certain point on the screen, between two interfering waves is $\frac{1}{8}$ th of wavelength. The ratio of the intensity at this point to that at the centre of a bright fringe…2019 · 11 Jan · Shift 1 · Q57 · MCQ
In a double-slit experiment, green light (5303 $A \circ$ ) falls on a double slit having a separation of 19.44 $μ$ m and awidht of 4.05 $μ$ m. The number of bright fringes between the first and the second diffraction…2019 · 11 Jan · Shift 2 · Q68 · MCQ
In a double slit experiment, when a thin film of thickness t having refractive index $μ$ . is introduced in front of one of the slits, the maximum at the centre of the fringe pattern shifts by one fringe width. The value of t is…2019 · 12 Apr · Shift 1 · Q59 · MCQ
The value of numerical aperature of the objective lens of a microscope is 1.25. If light of wavelength 5000 $A o$ is used, the minimum separation between two points, to be seen as distinct, will be :2019 · 12 Apr · Shift 1 · Q61 · MCQ
A system of three polarizers P1, P2, P3 is set up such that the pass axis of P3 is crossed with respect to that of P1. The pass axis of P2 is inclined at 60o to the pass axis of P3. When a beam of unpolarized light of intensity I0 is…2019 · 12 Apr · Shift 2 · Q54 · MCQ
Light of wavelength $550 nm$ falls normally on a slit of width $22.0 \times 1 0^{- 5} c m .$ The angular position of the second minima from the central maximum will (in radians) :2018 · 15 Apr · Shift 1 · Q59 · MCQ
A plane polarized light is incident on a polariser with its pass axis aking angle $θ$ with x-axis, as shown in the figure. At four different values of $θ, θ$ = 8o, 38o, 188o and 218o, the observed intensities are same.… Includes diagram2018 · 15 Apr · Shift 2 · Q50 · MCQ
Unpolarized light of intensity I is incident on a system of two polarizers, A followed by B. The intensity of emergent light is I/2. If a third polarizer C is placed between A and B, the intensity of emergent light is reduced to I/3. The…2018 · 16 Apr · Shift 1 · Q51 · MCQ
The angular width of the central maximum in a single slit diffraction pattern is 60°. The width of the slit is 1 $μ$ m. The slit is illuminated by monochromatic plane waves. If another slit of same width is made near it, Young’s fringes…2018 · Shift 0 · Q46 · MCQ
Unpolarized light of intensity I passes through an ideal polarizer A. Another identical polarizer B is placed behind A. The intensity of light beyond B is found to be I/2. Now another identical polarizer C is placed between A and B. The…2018 · Shift 0 · Q56 · MCQ
A single slit of width b is illuminated by a coherent monochromatic light of wavelength $λ$ . If the second and fourthminima in the diffraction pattern at a distance 1 m from the slit are at 3 cm and 6 cm respectively from the central…2017 · 8 Apr · Shift 1 · Q50 · MCQ
A single slit of width 0.1 mm is illuminated by a parallel beam of light of wavelength 6000 $A \circ$ and diffraction bands are observed on a screen 0.5 m from the slit. The distance of the third dark band from the central…2017 · 9 Apr · Shift 1 · Q55 · MCQ
In a Young’s double slit experiment, slits are separated by 0.5 mm, and the screen is placed 150 cm away. A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes on the screen. The least…2017 · Shift 0 · Q46 · MCQ
In Young’s double slit experiment, the distance between slits and the screen is 1.0 m and monochromatic light of 600 nm is being used. A person standing near the slits is looking at the fringe pattern. When the separation between the slits…2016 · 9 Apr · Shift 1 · Q56 · MCQ
Two stars are 10 light years away from the earth. They are seen through a telescope of objective diameter 30 cm. The wavelength of light is 600 nm. To see the stars just resolved by the telescope, the minimum distance between them should…2016 · 10 Apr · Shift 1 · Q51 · MCQ
The box of a pin hole camera, of length $L,$ has a hole of radius a. It is assumed that when the hole is illuminated by a parallel beam of light of wavelength $λ$ the spread of the spot (obtained on the opposite wall of the camera)…2016 · Shift 0 · Q45 · MCQ
Assuming human pupil to have a radius of $0.25 c m$ and a comfortable viewing distance of $25 c m$ , the minimum separation between two objects that human eye can resolve at $500 nm$ wavelength is :2015 · Shift 0 · Q48 · MCQ
On a hot summer night, the refractive index of air is smallest near the ground and increases with height from the ground. When a light beam is directed horizontally, the Huygens' principle leads us to conclude that as it travels, the light…2015 · Shift 0 · Q49 · MCQ
Two beams, $A$ and $B$ , of plane polarized light with mutually perpendicular planes of polarization are seen through a polaroid. From the position when the beam $A$ has maximum intensity (and beam $B$ has zero intensity), a rotation of…2014 · Shift 0 · Q54 · MCQ
Two coherent point sources $S_{1}$ and $S_{2}$ are separated by a small distance $^{'} d^{'}$ as shown. The fringes obtained on the screen will be Includes diagram2013 · Shift 0 · Q55 · MCQ
A beam of unpolarised light of intensity $I_{0}$ is passed through a polaroid $A$ and then through another polaroid $B$ which is oriented so that its principal plane makes an angle of $4 5^{\circ}$ relative to that of $A$ . The…2013 · Shift 0 · Q58 · MCQ
In Young's double slit experiment , one of the slit is wider than other, so that amplitude of the light from one slit is double of that from other slit. If $I_{m}$ be the maximum intensity, the resultant intensity $I$ when they…2012 · Shift 0 · Q51 · MCQ
This question has a paragraph followed by two statements, Statement $- 1$ and Statement $- 2$ . Of the given four alternatives after the statements, choose the one that describes the statements. A thin air film is formed by putting the convex…2011 · Shift 0 · Q55 · MCQ
An initially parallel cylindrical beam travels in a medium of refractive index $μ (I) = μ_{0} + μ_{2} I,$ where $μ_{0}$ and $μ_{2}$ are positive constants and $I$ is the intensity of the light beam. The…2010 · Shift 0 · Q59 · MCQ
A mixture of light, consisting of wavelength $590 nm$ and an unknown wavelength, illuminates Young's double slit and gives rise to two overlapping interference patterns on the screen. The central maximum of both lights coincide. Further, it…2009 · Shift 0 · Q56 · MCQ
In a Young's double slit experiment the intensity at a point where the path difference is $\frac{λ}{6}$ ( $λ$ being the wavelength of light used ) is $I$ . If $I_{0}$ denotes the maximum intensity, $\frac{I}{I _{0}}$ is equal to2007 · Shift 0 · Q69 · MCQ
Two point white dots are $1 mm$ apart on a black paper. They are viewed by eye of pupil diameter $3 mm .$ Approximately, what is the maximum distance at which these dots can be resolved by the eye? [ Take wavelength of light $= 500 nm$ ]2005 · Shift 0 · Q133 · MCQ
A Young's double slit experiment uses a monochromatic source. The shape of the interference fringes formed on a screen is2005 · Shift 0 · Q134 · MCQ
If $I_{0}$ is the intensity of the principal maximum in the single slit diffraction pattern, then what will be its intensity when the slit width is doubled?2005 · Shift 0 · Q136 · MCQ
When an unpolarized light of intensity $I_{0}$ is incident on a polarizing sheet, the intensity of the light which does not get transmitted is2005 · Shift 0 · Q137 · MCQ
The maximum number of possible interference maxima for slit-separation equal to twice the wavelength in Young's double-slit experiment, is :2004 · Shift 0 · Q119 · MCQ
The angle of incidence at which reflected light is totally polarized for reflection from air to glass (refractive index $n$ ) is :2004 · Shift 0 · Q126 · MCQ
To demonstrate the phenomenon of interference, we require two sources which emit radiation2003 · Shift 0 · Q139 · MCQ