Wave Optics Question 10
Question 10 - 2024 (30 Jan Shift 2)
A beam of unpolarised light of intensity $I _0$ is passed through a polaroid $A$ and then through another polaroid $B$ which is oriented so that its principal plane makes an angle of $45^{\circ}$ relative to that of $A$. The intensity of emergent light is :
(1) $I _0 / 4$
(2) $I _0$
(3) $I _0 / 2$
(4) $I _0 / 8$
Show Answer
Answer: (1)
Solution:
Intensity of emergent light
$=\frac{I _0}{2} \cos ^{2} 45^{\circ}=\frac{I _0}{4}$
