Q.

When plane surface of planoconvex lens is silvered its focal length comes out to be 28 cm. When convex surface is silvered focal length comes out to be 10 cm. The refractive index of lens is

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a

14/9

b

3.8

c

1.9

d

2.0

answer is A.

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Detailed Solution

2810=1(μ−1)×μ1⇒28μ−28=10μ⇒18μ=28⇒μ=2818=149
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When plane surface of planoconvex lens is silvered its focal length comes out to be 28 cm. When convex surface is silvered focal length comes out to be 10 cm. The refractive index of lens is