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A thin equiconvex lens is made of a glass of refractive index and its focal length isand its focal length is. If it acts as a concave lens of . If it acts as a concave lens of focal length when dipped in a liquid, the refractive index of the liquid is:

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answer is B.

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Detailed Solution

Concept- Here we have to find the correct option, thus we have to use the formula of lens maker Question Image

.
As per the data given in the above question is,
Refractive index

Focal length is

.
Concave lens focal length when dipped in a liquid

Refractive index of the liquid

Therefore using the formula of lens maker and the ratio we get,
Question Image

Substitute the value in above equation we get, Question Image

Thus, the refractive index of the liquid

.
Hence, the correct option is (2).

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