If in a plano-convex lens, the radius of...

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

20.5 cm

B

10 cm

C

15.5 cm

D

5 cm

Text Solution

Verified by Experts

The correct Answer is:

B

(b) Focal length,F=`R/(2(µ-1))`
`rArrF=10/(2(15-1))=10cm`

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