Q.

A convex lens of focal length 0.15 m is made of a material of refractive index32  . When it is placed in a liquid, its focal length is increased by 0.225m.  The refractive index of the liquid is

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a

74

b

54

c

94

d

32

answer is B.

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Detailed Solution

fliqfair=(μg−1)μℓ(32−μℓ) 0.15+0.2250.15=(32−1)μℓ(32−μℓ)⇒μℓ=54
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A convex lens of focal length 0.15 m is made of a material of refractive index32  . When it is placed in a liquid, its focal length is increased by 0.225m.  The refractive index of the liquid is