Q. A beam of natural light falls on a system of 5 polaroids, which are arranged in succession such that the pass axis of each Polaroid is turned through $60{^\circ}$ with respect to the preceding one. The fraction of the incident light intensity that passes through the system is
A) $\frac{1}{64}$
B) $\frac{1}{32}$
C) $\frac{1}{256}$
D) $\frac{1}{512}$
Explanation
(d) $I = \frac{I_{0}}{2}\ .\frac{1}{(4)^{4}}$
$= \frac{I_{0}}{512} = \frac{1}{512}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.