Two polaroids P_1 and P_2 are placed with the | vedclass

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(B) The intensity of unpolarised light incident on $P_1$ is $I_0$. After passing through $P_1$,the intensity becomes $I_1 = \frac{I_0}{2}$.The intensi

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$\frac{I_0}{8}$

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(B) The intensity of unpolarised light incident on $P_1$ is $I_0$. After passing through $P_1$,the intensity becomes $I_1 = \frac{I_0}{2}$.The intensity of light transmitted through $P_3$,which is at an angle $	heta_1 = 45^{\circ}$ with $P_1$,is given by Malus' Law: $I_2 = I_1 \cos^2(45^{\circ}) = \frac{I_0}{2} 	imes (\frac{1}{\sqrt{2}})^2 = \frac{I_0}{4}$.The angle between the axes of $P_3$ and $P_2$ is $	heta_2 = 90^{\circ} - 45^{\circ} = 45^{\circ}$.The intensity of light transmitted through $P_2$ is $I_3 = I_2 \cos^2(45^{\circ}) = \frac{I_0}{4} 	imes (\frac{1}{\sqrt{2}})^2 = \frac{I_0}{8}$.

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