Question

A thin equiconvex lens is made of a 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:                                 

A

B

C

D

Medium
Updated on : 2022-09-05
Solution
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Correct option is B)

Given, 

Using lens makers formula and taking ratios,





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