Q 12-10-027JEE MainEasy
Unpolarised light passes through three polaroids. The axis of the second is at $45°$ to the first, and the third is at $90°$ to the first. What percentage of the original intensity emerges?
Numerical value type. Enter your answer.
Answer: 12.5
$I = \dfrac{I_0}{2}\cos^2 45°\cos^2 45° = \dfrac{I_0}{8}$, i.e. $12.5\%$.
Solution by Sreeraj P, M.Sc Physics