First slide

Polarisation

Question

Two polaroids are kept crossed to each other. Now one of them is rotated through an angle of 45°. The percentage of incident light now transmitted through the system is :

Easy

A

15%
B

25%
C

50%
D

60%

Solution

$I = I_{0} \cos^{2} θ w h e n θ = 90^{0} I = 0 a$
$W h e n θ = 45^{0}$
$I = I_{0} \cos^{2} 45 = \frac{I_{0}}{2} = 50 %$

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