A beam of unpolarised light of intensity I0 is passed through a polaroid A and then through another polaroid B which is oriented so that its principal plane makes an angle of 45° relative to that of A. The intensity of the emergent light is:

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Physics

Polarisation of Light New

Question

A beam of unpolarised light of intensity I₀ is passed through a polaroid A and then through another polaroid B which is oriented so that its principal plane makes an angle of 45° relative to that of A. The intensity of the emergent light is:

I₀/4

I₀

I₀/8

I₀/2

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$I_{1} = \frac{I_{0}}{2}$

$I_{2} - I_{1} \cos^{2} θ = \frac{I_{0}}{2} \times {(\frac{1}{\sqrt{2}})}^{2}$