Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Geometrical Optics

78 questions · Physics · NEET
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /NEET
  3. /Physics
  4. /Geometrical Optics

Geometrical Optics

78 questions · Physics · NEET

  1. A microscope has an objective of focal length 2 cm , eyepiece of focal length 4 cm and the tube length of 40 cm . If the distance of distinct vision of eye is 25 cm , the magnification in the microscope is2025 · Q148 · MCQ
  2. In a certain camera, a combination of four similar thin convex lenses are arranged axially in contact. Then the power of the combination and the total magnification in comparison to the power ( p ) and magnification ( m ) for each lens…2025 · Q162 · MCQ
  3. A light ray enters through a right angled prism at point P with the angle of incidence 30∘ as shown in figure. It travels through the prism parallel to its base BC and emerges along the face AC. The refractive index of the… Includes diagram2024 · Q170 · MCQ
  4. A small telescope has an objective of focal length 140 cm and an eye piece of focal length 5.0 cm. The magnifying power of telescope for viewing a distant object is:2024 · Q188 · MCQ
  5. Given below are two statements: Statement I : Image formation needs regular reflection and/or refraction. Statement II : The variety in colour of objects we see around us is due to the constituent colours of the light incident on them. In…2024 · Q170 · MCQ
  6. A lens is made up of 3 different transparent media as shown in figure. A point object O is placed on its axis beyond 2f. How many real images will be obtained on the other side? Includes diagram2023 · Q130 · MCQ
  7. ϵ0​ and μ0​ are the electric permittivity and magnetic permeability of free space respectively. If the corresponding quantities of a medium are 2 ϵ0​ and 1.5 μ0​ respectively, the refractive index of the medium…2023 · Q141 · MCQ
  8. A horizontal ray of light is incident on the right angled prism with prism angle 6∘. If the refractive index of the material of the prism is 1.5 , then the angle of emergence will be: Includes diagram2023 · Q149 · MCQ
  9. An object is mounted on a wall. Its image of equal size is to be obtained on a parallel wall with the help of a convex lens placed between these walls. The lens is kept at distance x in front of the second wall. The required focal length…2023 · Q162 · MCQ
  10. Light travels a distance x in time t1​ in air and 10x in time t2​ in another denser medium. What is the critical angle for this medium?2023 · Q139 · MCQ
  11. In the figure shown here, what is the equivalent focal length of the combination of lenses (Assume that all layers are thin) ? Includes diagram2023 · Q158 · MCQ
  12. Two thin lenses are of same focal lengths (f), but one is convex and the other one is concave. When they are placed in contact with each other, the equivalent focal length of the combination will be :2023 · Q164 · MCQ
  13. During a cloudy day, a primary and a secondary rainbow may be created, then the :2022 · Q139 · MCQ
  14. An astronomical refracting telescope is being used by an observer to observe planets in normal adjustment. The focal lengths of the objective and eye piece used in the construction of the telescope are 20 m and 2 cm respectively. Consider…2022 · Q179 · MCQ
  15. A biconvex lens has radii of curvature, 20 cm each. If the refractive index of the material of the lens is 1.5, the power of the lens is2022 · Q130 · MCQ
  16. A light ray falls on a glass surface of refractive index 3​, at an angle 60∘. The angle between the refracted and reflected rays would be2022 · Q152 · MCQ
  17. Two transparent media A and B are separated by a plane boundary. The speed of light in those media are 1.5 × 108 m/s and 2.0 × 108 m/s, respectively. The critical angle for a ray of light for these two media is2022 · Q172 · MCQ
  18. Find the value of the angle of emergence from the prism. Refractive index of the glass is 3​ Includes diagram2021 · Q137 · MCQ
  19. A convex lens 'A' of focal length 20 cm and a concave lens 'B' of focal length 5 cm are kept along the same axis with a distance 'd' between them. If a parallel beam of light falling on 'A' leaves 'B' as a parallel beam, then the distance…2021 · Q147 · MCQ
  20. A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since :2021 · Q150 · MCQ
  21. A point object is placed at a distance of 60 cm from a convex lens of focal length 30 cm. If a plane mirror were put perpendicular to the principal axis of the lens and at a distance of 40 cm from it, the final image would be formed at a… Includes diagram2021 · Q172 · MCQ
  22. A ray is incident at an angle of incidence i on one surface of a small angle prism (with angle of prism A) and emerges normally from the opposite surface. If the refractive index of the material of the prism is μ, then the angle of…2020 · Q120 · MCQ
  23. The Brewster's angle ib for an interface should be :2020 · Q151 · MCQ
  24. In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction?2019 · Q119 · MCQ
  25. Pick the wrong answer in the context with rainbow.2019 · Q124 · MCQ
  26. Two similar thin equi-convex lenses, of focal length f each, are kept coaxially in contact with each other such that the focal length of the combination is F1. When the space between the two lenses is filled with glycerin (which has the…2019 · Q133 · MCQ
  27. An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm. If the object is displaced through a distance of 20 cm towards the mirror, the displacement of the image will be2018 · Q117 · MCQ
  28. The refractive index of the material of a prism is 2​ and the angle of the prism is 30°. One of the two refracting surfaces of the prism is made a mirror inwards, by silver coating. A beam of monochromatic light entering the prism…2018 · Q127 · MCQ
  29. An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of2018 · Q132 · MCQ
  30. A beam of light from a source L is incident normally on a plane mirror fixed at a certain distance x from the source. The beam is reflected back as a spot on a scale placed just above the source L. When the mirror is rotated through a…2017 · Q136 · MCQ
  31. A thin prism having refracting angle 10o is made of glass of refractive infex 1.42. This prism is combined with another thin prism of glass of refractive index 1.7. This combination producess dispersion without deviation. The refracting…2017 · Q137 · MCQ
  32. Match the corresponding entries of column 1 with column 2. [Where m is the magnification produced by the mirror] Includes table2016 · Q129 · MCQ
  33. The angle of incidence for a ray of light at a refracting surface of a prism is 45o. The angle of prism is 60o. If the ray suffers minimum deviation through the prism, the angle of minimum deviation and refractive index of the material of…2016 · Q132 · MCQ
  34. A astronomical telescope has objective and eyepiece of focal lengths 40 cm and 4 cm respectively. To view an object 200 cm away from the objective, the lenses must be separated by a distance2016 · Q133 · MCQ
  35. A person can see clearly objects only when they lie between 50 cm and 400 cm from his eyes . In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use. will be2016 · Q119 · MCQ
  36. Two identical glass (μg = 3/2) equiconvex lenses of focal length f each are kept in contact. The space between the two lenses is filled with water (μw​=4/3). The focal length of the combination is2016 · Q130 · MCQ
  37. An air bubble in a glass slab with refractive index 1.5 (near normal incidence) is 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The thickness (in cm) of the slab is2016 · Q132 · MCQ
  38. A beam of light consisting of red, green and blue colours is incifent on a right angled prism. The refractive index of the material of the prism for the above red, green and blue wavelengths are 1.39, 1.44 and 1.47 respectively. The prism… Includes diagram2015 · Q122 · MCQ
  39. In an astronomical telescope in normal adjustment a straight black line of length L is drawn on inside part of objective lens. The eye-piece forms a real image of this line. The length of this image is I. The magnification of the…2015 · Q123 · MCQ
  40. The refracting angle of a prism is A, and refractive index of the material of the prism is cot (A/2). The angle of minimum deviation is2015 · Q126 · MCQ
  41. Two identical thin plano-convex glass lenses (refractive index 1.5) each having radius of curvature of 20 cm are placed with their convex surfaces in contact at the centre. The intervening space is filled with oil of refractive index 1.7.…2015 · Q128 · MCQ
  42. The angle of a prism is A. One of its refracting surfaces is silvered. Light rays falling at an angle of incidence 2 A on the first surface returns back through the same path after suffering reflection at the silvered surface. The…2014 · Q130 · MCQ
  43. If the focal length of objective lens is increased then magnifying power of2014 · Q132 · MCQ
  44. Two plane mirrors are inclined at 70o. A ray incident on one mirror at angle, θ after reflection falls on second mirror and is reflected from there parallel to first mirror. The value of θ is2013 · Q122 · MCQ
  45. For a normal eye, the cornea of eye provides a converging power of 40 D and the least converging power of the eye lens behinf the cornea is 20 D. Using this information, the distance between the retina and the cornea-eye lens can be…2013 · Q121 · MCQ
  46. A plano convex lens fits exactly into a plano concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices μ1 and μ2 and R is the radius of curvature of the curved…2013 · Q132 · MCQ
  47. A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that its enf closer to the pole is 20 cm away from the mirror. The length of the image is2012 · Q86 · MCQ
  48. For the angle of minimum deviation of a prism to be equal to its refracting angle, the prism must be made of a material whose refractive index.2012 · Q87 · MCQ
  49. A ray of light is incident at an angle of incidence i, on one face of a prism of angle A (assumed to be small ) and emerges normally from the opposite face. If the refractive index of the prism is μ. the angle of incidence i, is…2012 · Q140 · MCQ
  50. When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a plane sheet of glass. This implies that the liquid must have refractive index2012 · Q141 · MCQ
  51. A concave mirror of focal length f1 is placed at a distance of d from a convex lens of focal length f2. A beam of light coming from infinity and falling on this convex lens − concave mirror combination returns to infinity. The…2012 · Q142 · MCQ
  52. The magnifying power of a telescope is 9. When it is adjusted for parallel rays the distance between the objective and eyepiece is 20 cm. The focal length of lenses are2012 · Q143 · MCQ
  53. A thin prism of angle 15o made of glass of refractive index μ1 = 1.5 is combined with another prism of glass of refractive index μ2 = 1.75. The combination of the prisms produces dispersion without deviation. The angle of the…2011 · Q88 · MCQ
  54. A converging beam of rays is incident on a diverging lens. Having passed through the lens the rays intersect at a point 15 cm from the lens on the opposite side. If the lens is removed the point where the rays meet will move 5 cm closer to…2011 · Q89 · MCQ
  55. Which of the following is not due to total internal reflection ?2011 · Q132 · MCQ
  56. A biconvex lens has a radius of curvature of magnitude 20 cm. Which one of the following options describe best the image formed of an object of height 2 cm placed 30 cm from the lens ?2011 · Q133 · MCQ
  57. A rays of light is incident on a 60o prism at the minimum deviation position. The angle of refraction at the first face (i.e., incident face) of the prism is2010 · Q80 · MCQ
  58. The speed of light in media M1 and M2 are 1.5 × 108 m/s and 2.0 × 108 m/s respectively. A ray of light enters from medium M1 to M2 at an incidence angle i. If the rays suffers total internal reflection, the value of i is2010 · Q81 · MCQ
  59. A ray of light travelling in a transparent medium of refractive index μ, falls on a surface separating the medium from air at an angle of incidence of 45o. For which of the following value of μ the ray can undergo total internal…2010 · Q139 · MCQ
  60. A lens having focal length f and aperture of diameter d forms an image of intensity I. Aperture of diameter 2d​ in central region of lens is covered by a black paper. Focal length of lens and intensity of image now will be…2010 · Q151 · MCQ
  61. Two thin lenses of focal lengths f1 and f2 are in contact and coaxial. The power of the combination is2008 · Q124 · MCQ
  62. A boy is trying to start a fire by focusing sunlight on a piece of paper using an equiconvex lens of focal length 10 cm. The diameter of the sun is 1.39 × 109 m and its mean distance from the earth is 1.5 × 1011 m. What…2008 · Q137 · MCQ
  63. A small coin is resting on the bottom of a beaker filled with liquid . A ray of light from the coin travels upto the surface of the liquid and moves along its surface. How fast is the light travelling in the liquid ? Includes diagram2007 · Q109 · MCQ
  64. A microscope is focussed on a mark on a piece of paper and then a slab of glass of thickness 3 cm and refractive index 1.5 is placed over the mark. How should the microscope be moved to get the mark in focus again ?2006 · Q142 · MCQ
  65. A convex lens and a concave lens, each having same focal length of 25 cm, are put in contact to form a combination of lenses. The power in diopters of the combination is2006 · Q143 · MCQ
  66. The refractive index of the material of a prism is 2​ and its refracting angle is 30o. One of the refracting surfaces of the prism is made a mirror inwards. A beam of monochromatic light entering the prism from the other face with…2004 · Q118 · MCQ
  67. A beam of light composed of red and green ray is incident obliquely at a point on the face of rectangular glass slab. When coming out on the opposite parallel face, the red green ray emerge from2004 · Q131 · MCQ
  68. An equiconvex lens is cut into two halves along (i) XOX' and (ii) YOY' as shown in the figure. Let f,f′, f′′ be the focal lengths of the complete lens, of each half in case (i), and of each half in case (ii), respectively. Choose the… Includes diagram2003 · Q129 · MCQ
  69. A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will2003 · Q141 · MCQ
  70. A bulb is located on a wall. Its image is to be obtained on a parallel wall with the help of convex lens. The lens is placed at a distance d ahead of second wall, then required focal length will be2002 · Q139 · MCQ
  71. For the given incident ray as shown in figure, the condition of total internal refraction of this ray the required refractive index of prism will be Includes diagram2002 · Q140 · MCQ
  72. Diameter of human eye lens is 2 mm. What will be the minimum distance between two points to resolve them, which are situated at a distance of 50 meter from eye. The wavelength of light is 5000 A∘​2002 · Q141 · MCQ
  73. Optical fibre are based on2001 · Q137 · MCQ
  74. A disc is placed on a surface of pond which has refractive index 5/3. A source of light is placed 4 m below the surface of liquid. The minimum radius of disc needed so that light is not coming out is,2001 · Q138 · MCQ
  75. A tall man of height 6 feet, want to see his full image. Then required minimum length of the mirror will be2000 · Q124 · MCQ
  76. A bubble in glass slab (μ = 1.5) when viewed from one side appears at 5 cm and 2 cm from other side, then thickness of slab is2000 · Q133 · MCQ
  77. Rainbow is formed due to2000 · Q134 · MCQ
  78. For a plano convex lens (μ = 1.5) has radius of curvature 10 cm. It is silvered on its plane surface. Find focal length after silvering2000 · Q135 · MCQ