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Q.

A planoconvex lens when silvered on the plane side behaves like a concave mirror of focal length 60 cm. However, when silvered on the convex side it behaves like a concave mirror of focal length 20 cm. Then the refractive index of the lens is

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a

3.0

b

1.5

c

1.0

d

2.0

answer is B.

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Detailed Solution

F1=R2π(−1)→(1)

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F2=R2π→(2)

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(1)(2)⇒μ=1.5

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