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Q.

A glass convex lens μg=1.5 has a focal length of 8 cm when placed in air. What would be the focal length of the lens when it is immersed in water (μw=1.33) ?

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a

2 m

b

4 cm

c

16 cm

d

32 cm

answer is D.

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Detailed Solution

flfa= aμg−1 aμg−1⇒fwfa=(1.5−1)1.5133−1⇒fw=32cm

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A glass convex lens μg=1.5 has a focal length of 8 cm when placed in air. What would be the focal length of the lens when it is immersed in water (μw=1.33) ?