Q.

A thin equiconvex lens is made of glass of refrctiveindex 1.5 and its focal length is 0.2m. If it acts as a concave lens of 0.5 m focal length when dipped in a liquid, the refractive index of liquid is

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a

9/8

b

17/8

c

13/8

d

15/8

answer is B.

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Detailed Solution

f1f=μg1μgμ11;   52=1232μ11;    μL=158

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