JEE MAIN - Physics (2024 - 30th January Evening Shift - No. 12)
A beam of unpolarised light of intensity $$I_0$$ is passed through a polaroid $$A$$ and then through another polaroid $$B$$ which is oriented so that its principal plane makes an angle of $$45^{\circ}$$ relative to that of $$A$$. The intensity of emergent light is:
$$I_0 / 2$$
$$I_0 / 8$$
$$I_0 / 4$$
$$I_0$$
Explanation
Intensity of emergent light
$$=\frac{\mathrm{I}_0}{2} \cos ^2 45^{\circ}=\frac{\mathrm{I}_0}{4}$$
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