A point source S is placed at the bottom of different layers

Last updated: 6/7/2023

A point source S is placed at the bottom of different layers as shown in the figure The refractive index of bottom most layer is uo The refractive index of any other upper layer is H n Ho where n 1 2 A 4n 18 ray of light with angle i slightly more than 30 starts from the source S Total internal reflection takes place at the upper surface of a layer having n equal to 60