Situation 25.1
The following are positioned in sequence: A source of a beam of natural light of intensity Io;three ideal polarizers A,B,and C;and an observer.Polarizer axis angles are measured clockwise from the vertical,from the perspective of the observer.The axis angle of polarizer A is set at zero degrees (vertical),and the axis angle of polarizer C is set at 50 degrees.
-In Situation 25.1,the axis angle of polarizer B is set at 120°.The ratio of the intensity of the beam at the observer to the intensity of the source is closest to:
A)0.015
B)0.020
C)0.025
D)0.030
E)0.035

Question

Quizplus · Accepted Answer

The intensity after passing through three polarizers is given by Malus's Law: I = Io * cos²(θ1) * cos²(θ2 - θ1) * cos²(θ3 - θ2). Here, θ1 = 0°, θ2 = 120°, and θ3 = 50°. Calculating this gives a ratio closest to 0.015.

Situation 25.1 the Following Are Positioned in Sequence: a Source of a of a Beam