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A fish situated at a depth h below the s...

A fish situated at a depth h below the surface of water in a lake ,can see the outside objects in air through a circular aperature of radius r . What is the radius of the aperture in terms of h and n ,where `n = ""_(a) n_(w) `? `[ ""_(a) n_(w)` = R.I. of water w.r.t. air]

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