Situation 33.3 The following are positioned insequence: A source of a beam of na

Question

Situation 33.3

The following are positioned insequence: A source of a beam of natural light ofintensity Io; threeideal polarizers A, B,and C;

and an observer. Polarizer axis anglesare measured clockwise from the vertical, from the perspective ofthe observer. The

axis angle of polarizerA is setat 0° (vertical), and the axis angle of polarizerC is setat 50°.

7) In Situation 33.3,polarizer B is setso that the beam intensity is zero at the observer. Thetwo

possible axis angle settings ofpolarizer B are:

7)

A) 90° and130°

B) 40° and130°

C) 40° and90°

D) 90° and140°

E) 40° and 140°

Explanation / Answer

Polarizer B must just be ±90 degrees from A or C. Sothe possible angles that would work are: . 90    140        (i.e 90 degrees fromA or 90 degrees from C) . There are other angles that would also work, but the answerthey want is     (D)

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