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Q.

There is a small air bubble inside a glass sphere ( μ= 1.5) of radius 10 cm. The bubble is 4 cm below the surface and is viewed normally from the outside. The apparent depth of the bubble is

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a

3 cm below the surface

b

5 cm below the surface

c

8 cm below the surface

d

10 cm below the surface

answer is A.

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Detailed Solution

μ2v-μ1u=μ2-μ1R ⇒1 v-1.5-4=1-1.5-10 ⇒v=-3.07 cm

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