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A glass sphere (μ = 1.5) of radius 20 cm has small air bubble 4 cm below its centre. The sphere is viewed from outside and along vertical line through the bubble. The apparent depth of the bubble below the surface of sphere is (in cm)

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a

13.33

b

26.67

c

15

d

30

answer is B.

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Detailed Solution

μ2v-μ1u=μ2-μ1R

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A glass sphere (μ = 1.5) of radius 20 cm has small air bubble 4 cm below its centre. The sphere is viewed from outside and along vertical line through the bubble. The apparent depth of the bubble below the surface of sphere is (in cm)