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A point source of light is placed 4 m below the surface of liquid of refractive index 5/3. The minimum diameter of a disc, which should be placed over the source, on the surface of liquid to cut-off all light coming out of water s

Answer» A point source of light is placed 4 m below the surface of liquid of refractive index 5/3. The minimum diameter of a disc, which should be placed over the source, on the surface of liquid to cut-off all light coming out of water s


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