Two polaroide $\mathrm{A}$ and $\mathrm{B}$ are placed in such a way that the pass-axis of polaroids are perpendicular to each other. Now, another polaroid $\mathrm{C}$ is placed between $\mathrm{A}$ and $\mathrm{B}$ bisecting angle between them. If intensity of unpolarized light is $\mathrm{I}_{0}$ then intensity of transmitted light after passing through polaroid $\mathrm{B}$ will be:
Solution
$\mathrm{I}_{\mathrm{A}}=\frac{\mathrm{I}_{\mathrm{o}}}{2}$
<br/><br/>$\mathrm{I_C}=\frac{\mathrm{I}_{\mathrm{o}}}{2} \cos ^{2} 45=\frac{\mathrm{I}_{\mathrm{o}}}{4}$
<br/><br/>$\mathrm{I}_{\mathrm{B}}=\mathrm{I}_{\mathrm{C}} \cos ^{2} 45=\frac{\mathrm{I}_{\mathrm{o}}}{8}$
About this question
Subject: Physics · Chapter: Optics · Topic: Reflection and Mirrors
This question is part of PrepWiser's free JEE Main question bank. 197 more solved questions on Optics are available — start with the harder ones if your accuracy is >70%.