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Q.(I) Unpolished light of intensity $I_0$ is incident on a polaroid $P_1$, which is kept near another polaroid $P_2$ whose pass axis is parallel to that of $P_1$. How will the intensities of light, $I_1 and I_2$, transmitted by the polaroid's $P_1$ and $P_2$ respectively, change on rotating $P_1$ without disturbing $P_2$?