Question

Consider a tank made of glass (refractive index 1.5) with a thick bottom. It is filled with a liquid of refractive index μ .  A student finds that, irrespective of what the incident angle i (see figure) is for a beam of light entering the liquid, the light reflected from the liquid glass interface is never completely polarized. For this to happen, the minimum value of μ is:

(1)   3/√5

(2)   3/√5

(3)   5√3

(4)   4/3

Answer 1

Correct option  1)   3/√5

Explanation:

C < i_b

Here i_b  is ‘brewester angle’ 

 And ‘c’ is critical angle