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 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

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 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 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

A jar of height h is filled wih a transparent liquid of refractive index mu , Fig. At the centre of the jar on the botom surface is a dot. Find the minimum diameter of a disc, such that when placed on the top surface symmetrically about the centre, the dot is invisible. .

A disc is placed on the surface of pond filled with liquid of refractive index (5)/(3) . A source of light is placed 4m below the surface of liquid. Calculate the minimum area of the disc so that light does not come out of liquid.

A point source of light is placed at a depth of h below the surface of water of refractive index mu . A floating opaque disc is placed on the surface of water so that light from the source is not visible from the surface. The minimum diameter of the disc is