### 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.