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

Multiple Choice

The following items are positioned in sequence: A source of a beam of natural light of intensity $I _ { 0 }$ , three ideal polarizers A, B, and $\mathrm { C }$ ; and an observer. Polarizer axis angles are measured clockwise from the vertical, as viewed by the observer. The axis angle of polarizer $\mathrm { A }$ is set at $0 ^ { \circ }$ (vertical) , and the axis angle of polarizer $C$ is set at $50 ^ { \circ }$ . Polarizer $B$ is set so that the beam intensity at the observer is a maximum. What is the axis angle settings of polarizer B?

A) $75 ^ { \circ }$
B) $0 ^ { \circ }$
C) $100 ^ { \circ }$
D) $25 ^ { \circ }$
E) $50 ^ { \circ }$