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

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(C) $1$. When unpolarised light of intensity $I_0$ passes through the first polaroid $A$, the intensity of the transmitted light becomes $I_1 = I_0/2$

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$I_0/8$

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(C) $1$. When unpolarised light of intensity $I_0$ passes through the first polaroid $A$, the intensity of the transmitted light becomes $I_1 = I_0/2$.$2$. The pass-axis of polaroid $A$ is at $0^\circ$ and polaroid $B$ is at $90^\circ$. Polaroid $C$ is placed at an angle of $45^\circ$ to $A$.$3$. According to Malus's Law, $I = I_{max} \cos^2 	heta$. The intensity after passing through $C$ is $I_2 = I_1 \cos^2(45^\circ) = (I_0/2) 	imes (1/\sqrt{2})^2 = I_0/4$.$4$. The angle between the pass-axes of $C$ and $B$ is $90^\circ - 45^\circ = 45^\circ$. The intensity after passing through $B$ is $I_3 = I_2 \cos^2(45^\circ) = (I_0/4) 	imes (1/\sqrt{2})^2 = I_0/8$.

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