First slide

Polarisation

Question

A beam of natural light falls on a system of 6 polaroids, which are arranged in succession such that each polaroid is turned through 30⁰ with respect to the preceding one. The percentage of incident intensity that passes through the system will be

Moderate

A

100%
B

50%
C

30%
D

12%

Solution

If I is the final intensity and I₀ is the initial intensity then
$I = \frac{I_{0}}{2} {(\cos^{2} 30^{\circ})}^{5} or \frac{I}{I_{0}} = \frac{1}{2} \times {(\frac{\sqrt{3}}{2})}^{10} = 0 .12$

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