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Q.

A thin plano – convex lens acts like a concave mirror of focal length 0.4 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

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a

0.4 m

b

0.2 m

c

0.1 m

d

0.75 m

answer is A.

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Detailed Solution

f=R2(μ−1)⇒R=2(μ−1)f                      ⇒2(1.5−1)×0.4⇒0.4m
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