First slide

Polarisation

Question

Two Nicols are oriented with their principal planes making an angle of 60⁰. The percentage of incident unpolarised light which passes through the system is

Moderate

A

50%
B

100%
C

12.5%
D

37.5%

Solution

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

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