First slide

The lens

Question

A thin plano-convex lens acts like a concave mirror of focal length 0.2 m when silvered from its plane surface. The refractive index of the material of the lens is 1.5. The radius of curvature of the convex surface of the lens will be

Moderate

A

0.4 m
B

0.2 m
C

0.1 m
D

0.75 m

Solution

$f = \frac{R}{2 (μ - 1)} \Rightarrow R = 2 f (μ - 1) = 2 \times 0 .2 (1 .5 - 1) = 0 .2 m$

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