Home
Class 12
PHYSICS
A planoconvex len becomes an optical s...

A planoconvex len becomes an optical system of 28 cm focal length when its plane surface is silvered illuminated from left to right as shown in Fig-A.
It the same lens is instead silvered on the curved surface and illuminated from other side as in Fig.B, it acts like an optical system of focal length 10 cm. The refractive index of the material of lens is :

A

Option1 `1.75`

B

Option2 `1.50`

C

Option3 `1.55`

D

Option4 `1.51`

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • JEE MAINS

    JEE MAINS PREVIOUS YEAR ENGLISH|Exercise Chemistry|1 Videos

  • JEE MAIN

    JEE MAINS PREVIOUS YEAR ENGLISH|Exercise All Questions|452 Videos

  • JEE MAINS 2020

    JEE MAINS PREVIOUS YEAR ENGLISH|Exercise PHYSICS|250 Videos

Similar Questions

Explore conceptually related problems

What is the focal length if plane surface is silvered in previous illustration.

A plano convex lens has focal length f = 20 cm . If its plane surface is silvered, then new focal length will be

For a plano convex lens, the radius of curvature of convex surface is 10 cm and the focal length is 30 cm. The refractive index of the material of the lens is

If in a planoconvex lens, the radius of curvature of the convex surface is 10cm and the focal length is 30 cm , the refractive index of the material of the lens will be

Find the focal length of the lens shown in the Fig..

The focal length of a plano-concave lens is -10 cm , then its focal length when its palne surface is polished is

Find the focal length of the lens shown in Fig.

If in a plano-convex lens, the radius of curvature of the convex surface is 10 cm and the focal length of the lens is 30 cm , then the refractive index of the material of lens will be

A plano-convex lens when silvered ono the plane side behaves like a concave mirror of focal length 60 cm. However, when silvered on the convex side, it behaves like a concave mirror of focal length 20cm. Then, the refractive index of the lens is

A plano-convex lens when silvered in the plane side behaves like a concave mirror of focal length 30 cm. However, when silvered on the convex side it behaves like concave mirror of focal length 10 cm. Then the refractive index of its material will be: