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Q.

The focal length of a convex lens of refractive index 1.5 is 'f' when it is placed in air. When it is immersed in a liquid it behaves as a converging lens and its focal length becomes xf (x > 1). The refractive index of the liquid is

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a

< 3/2

b

= 3/2

c

> 3/2

d

< 3/2 and > 1

answer is B.

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Detailed Solution

Nature of lens does not change. 

Hence refractive index of liquid is less than that of lens and more than that of air.

 32>μl>1.

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