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A point source of light is placed 4 m below thesurface of water of refractive index 5/3 The minimumdiameter of a disc - which should be placed over thesource - on the surface of water to cut off all light comingout of water is [1994]

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A point source of light is placed 4 m below thesurface of water of refractive index 5/3 The minimumdiameter of a disc - which should be placed over thesource - on the surface of water to cut off all light comingout of water is [1994]






 
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