A Initially AB is the interface of slab of refractive index

Last updated: 6/13/2023

A Initially AB is the interface of slab of refractive index u and air A ray of light strikes at AB at the critical angle C Oc Now a slab ABCD of refractive indexu is placed so that total internal reflection takes place at surface CD not at surface AB What should be the value of u 1 2 3 4 Greater than u Equal to u 8 51 Lesser than u Any value greater smaller or equal to u