Q.

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

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a

138

b

178

c

98

d

158

answer is B.

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Detailed Solution

flfa=g1g10.50.2=1.51g1lμg1=0.2 lμg=0.8=45 aμg aμl=451.5 aμl=45 l=158

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