A point source of light is place 4 m below the surface of

Last updated: 5/30/2023

A point source of light is place 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 all light coming out of water is 5 3 1 2 m 2 6 m 3 4 m 4 3 m