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Question

Physics Question on spherical lenses

Focal length of plano-convex lens of refractive index n and radius of curvature R is

A

f = R

B

f=R2f=\frac{R}{2}

C

f=n−1Rf=\frac{n-1}{R}

D

f=Rn−1f=\frac{R}{n-1}

Answer

f=Rn−1f=\frac{R}{n-1}

Explanation

Solution

The correct option is (D): f=Rn−1f=\frac{R}{n-1}