JEE MainPhysicsGeometrical OpticsNumerical+4 / −1
A compound microscope consists of an objective lens of focal length 1 cm and an eyepiece of focal length 5 cm with a separation of 10 cm. The distance between an object and the objective lens, at which the strain on the eye is minimum is cm. The value of n is .
Numerical answer
More from Geometrical Optics
- For a concave lens of focal length f, the relation between object and image distances u and v, respectively, from its pole can best be represented by (u = v is the reference line) :2020 · MCQ
- A prism of angle A = 1o has a refractive index = 1.5. A good estimate for the minimum angle of deviation (in degrees) is close to . Value of N is .2020 · Numerical
- A point like object is placed at a distance of 1 m in front of a convex lens of focal length 0.5 m. A plane mirror is placed at a distance of 2 m behind the lens. The position and nature of the final image formed by the system is :2020 · MCQ
- A double convex lens has power P and same radii of curvature R of both the surfaces. The radius of curvature of a surface of a plano-convex lens made of the same material with power 1.5 P is :2020 · MCQ
- If we need a magnification of 375 from a compound microscope of tube length 150 mm and an objective of focal length 5 mm, the focal length of the eye-piece, should be close to :2020 · MCQ
- A thin lens made of glass (refractive index = 1.5) of focal length f = 16 cm is immersed in a liquid of refractive index 1.42. If its focal length in liquid is f1 , then the ratio is closest to the integer :2020 · MCQ
- A point object in air is in front of the curved surface of a plano-convex lens. The radius of curvature of the curved surface is 30 cm and the refractive index of the lens material is 1.5, then the focal length of the lens (in cm) is …2020 · Numerical
- The critical angle of a medium for a specific wavelength, if the medium has relative permittivity 3 and relative permeability for this wavelength, will be :2020 · MCQ