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 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 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 point source of light is placed 4 cm 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 point soujrce 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 alol light coming out of water is

In a tank filled with a liquid of refractive index 5//3 , a point source of light is placed 2 m below the surface of water. To cut off all light coming out of water from the source, what should be the minimum diameter of a disc, which should be placed over the source on the surface of water ?

A small source of light is 4m below the surface of a liquid of refractive index 5//3 .In order to cut off all the light comingout of liquid surface,minimum diameter of the disc placed on the surface of liquid is

A point source is placed at a depth h below the surface of water (refractive index = mu ). The medium above the surface of water is air from water.

A point source is placed at a depth h below the surface of water (refractive index = mu ). The medium above the surface area of water is air from water.