Q 12-10-071JEE MainJEE Main 2024 (30 Jan, Shift 2)Easy
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 the emergent light is:
Answer: (A) $\dfrac{I_0}{4}$
After $A$: $\dfrac{I_0}{2}$. After $B$ (Malus's law): $\dfrac{I_0}{2}\cos^2 45^\circ = \dfrac{I_0}{4}$.
Solution by Sreeraj P, M.Sc Physics