Question

Two Nicols are oriented with their principal planes making an angle of $ 60^{\circ}$ . The percentage of incident unpolarized light which passes through the system is

• A. 50%
• B. 100%
• C. 12.5%
• D. 37.5%

Answer 1

Answer: (C)

Intensity of polarized light from first polarizer
$=\frac{100}{2}=50$
$I=I_{0} \cos ^{2} \theta$
$=50 \cos ^{2} 60^{\circ}$
$=\frac{50}{4}=12.5$