At what angle should the axes of two Polaroids be placed so as to reduce the intensity of the incident unpolarized light to 1515.

Complete  Question

At what angle should the axes of two Polaroids be placed so as to reduce the intensity of the incident unpolarized light to 1/5.

The  angle is  

Explanation:

From the question we are told that

   The light emerging from second Polaroid is 1/5 the  unpolarized

Generally the intensity of light emerging from the first Polaroid is mathematically represented as

Generally from the Malus law the intensity of light emerging from the second Polaroid  is mathematically represented

=>  

=>  

From the question

=>    

=>    

a. is the answer because they are not shared