An unpolarized light of certain intensity pas | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) Let $I_0$ be the initial intensity of unpolarized light.$1$. Without the third polarizer: The first polarizer reduces intensity to $I_1 = I_0/2$.

Vedclass · Accepted Answer

$9$/$4$

Vedclass · Answer

(C) Let $I_0$ be the initial intensity of unpolarized light.$1$. Without the third polarizer: The first polarizer reduces intensity to $I_1 = I_0/2$. The second polarizer at $90^\circ$ relative to the first (which is at $30^\circ$) has an angle $	heta = 90^\circ - 30^\circ = 60^\circ$. The output intensity is $I_{final} = I_1 \cos^2(60^\circ) = (I_0/2) 	imes (1/4) = I_0/8$.$2$. With the third polarizer at $60^\circ$: $I_1 = I_0/2$. Intensity after the third polarizer (angle $60^\circ - 30^\circ = 30^\circ$): $I_2 = I_1 \cos^2(30^\circ) = (I_0/2) 	imes (3/4) = 3I_0/8$. Intensity after the second polarizer (angle $90^\circ - 60^\circ = 30^\circ$): $I_{final}' = I_2 \cos^2(30^\circ) = (3I_0/8) 	imes (3/4) = 9I_0/32$.Ratio = $(9I_0/32) / (I_0/8) = 9/4$.

Similar Questions

Indicate the signals used for unpolarised,polarised,and partially polarised light.

Plane-polarized light passes through a Polaroid. While observing through the Polaroid,it is seen that when the Polaroid completes one rotation about the direction of light,which of the following is observed?

Vedclass Test Series

Exam Paper Generator

Online Exam Module