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Question: A thin plano-convex lens acts like a concave mirror of focal length 0.2 m, when silvered on its plan...

A thin plano-convex lens acts like a concave mirror of focal length 0.2 m, when silvered on its plane surface. The refractive index of lens material is 1.5. The radius of curvature of curved surface is –

A

0.1 m

B

0.2 m

C

0.4 m

D

0.8m

Answer

0.2 m

Explanation

Solution

f = – \ – 0.2 = −R2(1.5−1)\frac { - \mathrm { R } } { 2 ( 1.5 - 1 ) }

\ R = 0.2m