Question

As shown in the figure, three identical polaroids P1, P2 and P3 are placed one after another. The pass axis of P2 and P3 are inclined at angle of $60\degree$ and $90\degree$ with respect to axis of P1. The source S has an intensity of 256 W/m2. The intensity of light at point O is ______ W/m2.

Answer 1

The correct answer is 24