The light energy escaping from the Sun can be spread by

Light from the Sun reaches us in nearly

A point source of light is placed at a depth h=0.5 m below the surface of a liquid (mu=5/4) , Then , the fraction of light energy that escape directly from the liquid surface is

A point source of light is placed at a depth h=0.5 m below the surface of a liquid (mu=5/4) , Then , the fraction of light energy that escape directly from the liquid surface is

A point source of light is placed at a distance h below the surface of a large and deep lake. If f is the fraction of light energy that escapes directly from water surface and mu is refractive index of water then:

________ is the energy obtained from the sun.