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Example of Ray optics Example  of Ray optics: a small fish, 0.4 m below the surface of a lake, is viewed through a simple converging lense of focal length 3 m. the lense is kept at 0.2 m above the water surface, such that the fish lies on the optical axis of the lens. Find the image of the fish seen by the observer. The refractive index of water is 4/3. Solution : Here, the first refraction takes place from water to air at plane water air interface. Now                   u = -0.4m,     v=? As                     w µ a   = 1/ a µ w =v/u                           1/(4/3) =u/-0.4              v...