There is a small air bubble inside a glass sphere of radius 5cm.The bubble is at O at 7.5cm below surafce of glass.The sphere is placed inside water such that the top surface of glass is 10cm below surface of water.The bubble is viewed normally from air.The apparent depth of the bubble is?

Ans

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Ans

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First image is formed through spherical surface then from plane surface.

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In this case there are two refraction taking place. First from spherical surface and second from plane

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