When unpolarised light is passed through cros | vedclass

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(C) When unpolarised light passes through the first polaroid, it becomes linearly polarised with intensity $I_0 = I_{in} / 2$.When this polarised ligh

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is blocked by the second polaroid.

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(C) When unpolarised light passes through the first polaroid, it becomes linearly polarised with intensity $I_0 = I_{in} / 2$.When this polarised light hits the second polaroid, the intensity transmitted is given by Malus' Law: $I = I_0 \cos^2 	heta$.Since the polaroids are crossed, the angle between their transmission axes is $	heta = 90^{\circ}$.Substituting this value, we get $I = I_0 \cos^2(90^{\circ}) = I_0 	imes 0 = 0$.Therefore, the light is completely blocked by the second polaroid.

When unpolarised light is passed through crossed polaroids, then light passing through the first polaroid:

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