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

question 6

Multiple Choice

The following items 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,as viewed by 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.What are the two possible axis angle settings (less than 180°) of polarizer B?

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