Two polariods P1 and P2 are placed with their pass axes perpendicular to each other. Unpolarised light of intensity Io is incident on P1. A third polaroid P3 is kept in between P1 and P2 such that its pass axis makes an angle 450 with that of P1. determine the intensity of light transmitted though P1, P2 and P3.
After passing through P1 , the intensity of light become I1 = Io/2
As angle between P1 and P3 is 45o , so after passing through it intensity become
Now the angle between P3 and P2 is 45o , so after passing through it intensity become
As angle between P1 and P3 is 45o , so after passing through it intensity become
Now the angle between P3 and P2 is 45o , so after passing through it intensity become