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

Last updated: 6/7/2023

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 all light coming out of water is a 1 m c 3 m b 4 m d 6 m