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

Multiple Choice

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