-->

Wave Optics

Question
CBSEENPH12039393

A narrow beam of unpolarized light of intensity I0 is incident on a Polaroid P1. The light transmitted by it is then incident on a second polaroid P2 with its pass axis making the angle of 60° relatives to the pass axis of P1. Find the intensity of the light transmitted by P2.

Solution

According to Malus’ Law:
straight I space equals space straight I subscript straight o space cos squared space straight theta
therefore space straight I space equals space open parentheses straight I subscript 0 over 2 close parentheses Cos squared straight theta
Where space straight I subscript 0 space is space the space intensity space of space unpolarized space light
straight theta space equals space 60 to the power of 0 space left parenthesis given right parenthesis
straight I space equals space straight I subscript 0 over 2 cos squared 60 space equals space straight I subscript straight o over 2 space straight x open parentheses 1 half close parentheses squared space equals space straight I subscript straight o over 8