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