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

A point source of light is placed 4 m below the surface of a transpare

1.	A point source of light is placed 4 m below the surface of a transparent liquid of refractive index 5/3. The minimum diameter of a disc which should be placed over the surface of the liquid to cut off all light coming out of the liquid is :
Answer» 3 m 4 m 1 m 6 m Answer :B

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

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