Wave Optics Question 8
Question 8 - 31 January - Shift 1
Two polaroide A and B are placed in such a way that the pass-axis of polaroids are perpendicular to each other. Now, another polaroid $C$ is placed between A and B bisecting angle between them. If intensity of unpolarised light is $I_0$ then intensity of transmitted light after passing through polaroid B will be :
(1) $\frac{I_0}{4}$
(2) $\frac{I_0}{2}$
(3) $\frac{I_0}{8}$
(4) Zero
Show Answer
Answer: (3)
Solution:
Formula: YDSE
$I_A=\frac{I_0}{2}$
IC $=\frac{I_o}{2} \cos ^{2} 45=\frac{I_o}{4}$
$I_B=I_C \cos ^{2} 45=\frac{I_o}{8}$
Option 3.
