A point source of light is placed 4 m below the surface of water of refractive index `(5)/(3).` The minimum diameter of a disc, which should be placed over the source, on the surface of water to cut off light coming out of water isA. 2 mB. 6 mC. 4 mD. 3 m

A point source of light is placed 4 m below the surface of water of re

1.	A point source of light is placed 4 m below the surface of water of refractive index `(5)/(3).` The minimum diameter of a disc, which should be placed over the source, on the surface of water to cut off light coming out of water isA. 2 mB. 6 mC. 4 mD. 3 m
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A point source of light is placed 4 m below the surface of water of refractive index `(5)/(3).` The minimum diameter of a disc, which should be placed over the source, on the surface of water to cut off light coming out of water isA. 2 mB. 6 mC. 4 mD. 3 m

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