AIIMS 2018 Physics Polarization MCQ Question

In the given optical setup, the intensity of the emergent light can be determined using Malus's Law, which states that the transmitted intensity $I$ through a polarizer is given by $I = I_0 \cos^2 \theta$, where $\theta$ is the angle between the light's polarization direction and the axis of the polarizer. For two polarizers, if the first polarizer transmits intensity $I_0$ and the second is oriented at $15^\circ$ relative to the first, the final intensity becomes $I = \frac{I_0}{2} \cos^2 15^\circ$, confirming option A as correct.

Options B and C incorrectly apply the cosine factor or miscalculate the intensity after two polarizers, while option D introduces an unnecessary factor that does not align with the principles of intensity transmission through polarizers.