Q. An unpolarised beam of intensity $2\ a^{2}$ passes through a thin Polaroid. Assuming zero absorption in the Polaroid, the intensity of emergent plane polarized light is
A) $2\ a^{2}$
B) $a^{2}$
C) $\sqrt{2}a^{2}$
D) $\frac{a^{2}}{2}$
Explanation
(b) The intensity of plane polarised light is=$2a^{2}$.
$\therefore$ Intensity of polarised light from first nicol prism
$= \frac{I_{0}}{2} = \frac{1}{2} \times 2a^{2} = a^{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.