The Following Are Positioned in Sequence: a Source of a Beam

question 13

Multiple Choice

The following are positioned in sequence: A source of a beam of natural light of intensity I₀; 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 0° (vertical) ,and the axis angle of polarizer C is set at 50°.Polarizer B is set so that the beam intensity is zero at the observer.Which of the following pairs of angles are possible axis angle settings of polarizer B?

• A) 40° and 90°
• B) 40° and 130°
• C) 40° and 140°
• D) 90° and 130°
• E) 90° and 140°