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NEET 2022
Exam
NEET
Year
2022
Subject
Physics
Chapter
Wave Optics

NEET 2022 · Physics · Wave Optics

After passing through a polariser a linearly polarised light of...

After passing through a polariser a linearly polarised light of intensity I\mathrm{I} is incident on an analyser making an angle of 30∘30^{\circ} with that of the polariser. The intensity of light emitted from the analyser will be :

Options

  1. A\frac{\mathrm{I}}{2}
  2. B\frac{\mathrm{I}}{3}
  3. C3I4\frac{3 I}{4}
  4. D2I4\frac{2 I}{4}

Correct answer

C. 3I4\frac{3 I}{4}

Step-by-step solution

As per Malus law, I=\mathrm{I}=\mathrm{I}0cos⁡2ϕ_0 \cos ^2 \phi, where symbols have their usual meanings. I′=Icos⁡230∘I′=I(32)2I′=3I4\begin{aligned} & I^{\prime}=I \cos ^2 30^{\circ} \\ & I^{\prime}=I\left(\frac{\sqrt{3}}{2}\right)^2 \\ & I^{\prime}=\frac{3 I}{4} \end{aligned}
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