Two polaroids A and B are placed in such a wa | vedclass

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(C) When unpolarised light of intensity $I_0$ passes through the first polaroid $A$,the intensity of the transmitted light is $I_A = \frac{I_0}{2}$.Th

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$\frac{I_0}{8}$

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(C) When unpolarised light of intensity $I_0$ passes through the first polaroid $A$,the intensity of the transmitted light is $I_A = \frac{I_0}{2}$.The pass-axis of polaroid $C$ makes an angle of $45^{\circ}$ with the pass-axis of $A$. According to Malus' Law,the intensity of light after passing through $C$ is $I_C = I_A \cos^2(45^{\circ}) = \frac{I_0}{2} 	imes (\frac{1}{\sqrt{2}})^2 = \frac{I_0}{4}$.The pass-axis of polaroid $B$ is perpendicular to $A$,so it makes an angle of $45^{\circ}$ with the pass-axis of $C$. The intensity of light after passing through $B$ is $I_B = I_C \cos^2(45^{\circ}) = \frac{I_0}{4} 	imes (\frac{1}{\sqrt{2}})^2 = \frac{I_0}{8}$.

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