Physics · Wave Optics

JEE Advanced 2024 — Paper 1 — Question 27

A point source $S$ emits unpolarized light uniformly in all directions. At two points $A$ and $B$ , the ratio $r=I_{A} / I_{B}$ of the intensities of light is 2 .If a set of two polaroids having $45^{\circ}$ angle between their pass-axes is placed just before point $B$ , then the new value of $r$ will be $\qquad$

Answer: 8

Numerical answer — enter this value.

Step-by-step solution

$\mid \propto 1 / r^{2}$ $I_{A} / I_{B=}=\frac{I_{A}}{I_{B}}=\left(\frac{r_{B}}{n}\right)^{2}=2$ $I_{B}^{\prime}=\frac{I_{B}}{2} \cos 45^{\circ}$ $l_{B}^{\prime}=I_{B} / 4$ $I_{B^{\prime}}=\frac{I_{B}}{4}$ $\frac{I_{A}}{I_{B}^{\prime}}=\frac{I_{A}}{\frac{I_{B}}{4}}=8$

Answer key and solution verified before publishing.

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Exam: JEE Advanced 2024
Paper: Paper 1
Subject: Physics
Chapter: Wave Optics
Topic: Polarization of Light Waves