JEE Main 9 Jan 2020 Shift 2 Solved Paper

There is a small source of light at some depth below the surface of water (refractive index =

4

3

) in a tank of large cross sectional surface area. Neglecting any reflection from the bottom and absorption by water, percentage of light that emerges out of surface is (nearly) : [Use the fact that surface area of a spherical cap of height h and radius of curvature r is 2 πrh]: