A glass sphere (µ = 1.5) of radius 20 cm has a small air bubble 4 cm below its centre. The sphere is viewed from outside and along a vertical line through the bubble. The apparent depth of the bubble below the surface of sphere is (in cm)
(1) 13.33                   (2) 26.67                  (3) 15                     (4) 30

μ=1.5R=20 cm , apparent depth=4+20-20-41.5=13.33Regards

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