Unpolarized light passes through two polarizers whose transmission axes are at an angle of 42.0 degrees with respect to each other. What fraction of the incident intensity is BLOCKED by the polarizers

The value is  

Explanation:

From the question we are told that

   The angle between the transmission axes of the polarizer

Gnerally the intensity light emerging from the first polarizer is  

Generally according to  malus's law the intensity of light emerging from the second polarizer is mathematically represented as

=>                  

=>                  

Generally  the incident intensity is BLOCKED by the polarizers is mathematically represented as

=>        

=>      

Hence the  fraction of the incident intensity is BLOCKED by the polarizers is