The following are positioned in sequence: A source of a beam of natural light of

Question

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, polarizer B is set so that the beam intensity is zero at the observer. The two possible axis angle settings of polarizer B are:

A) 40 ° and 90 °

B) 40 ° and 130 °

C) 40 ° and 140 °

D) 90 ° and 130 °

Explanation / Answer

ans is E

Ib= Ia cos^2 x

Ic = Ib cos^2 y = Ia cos ^2 x cos ^2 y

for the output intensity to be zero,

cosx =0 for x= 90 ,

but already the C is at angle 50 , so , 2nd angle becomes 140

apply above formula for 2nd case

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