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Question

Physics Question on Ray optics and optical instruments

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

A

1.5

B

1.66

C

1.33

D

3

Answer

1.33

Explanation

Solution

For piano convex lens we have 1f=(n−1)(1R)\frac{1}{f} =(n-1)\left(\frac{1}{R}\right) Here f = 30 cm, R=10 cm. This gives n = 1.33