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Q.

Focal length of a convex lens of refractive index 1.5 is 2 cm. Focal length of lens when immersed in a liquid of refractive index of 1.25 will be

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a

10 cm

b

2.5 cm

c

5 cm

d

7.5 cm

answer is C.

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Detailed Solution

flfa=aμg−1 lμg−1=aμg−1 aμg aμl−1⇒fl2=1.5−11.51.25−1⇒fl=5cm
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