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Question: Answered & Verified by Expert
An unpolarized beam of light of intensity $\mathrm{I}_{0}$ passes through two linear polarizers making an angle of $30^{\circ}$ with respect to each other. The emergent beam will have an intensity -
PhysicsWave OpticsKVPYKVPY 2012 (SB/SX)
Options:
  • A $\frac{3 \mathrm{I}_{0}}{4}$
  • B $\frac{\sqrt{3} \mathrm{I}_{0}}{4}$
  • C $\frac{3 \mathrm{I}_{0}}{8}$
  • D $\frac{\mathrm{I}_{0}}{8}$
Solution:
2328 Upvotes Verified Answer
The correct answer is: $\frac{3 \mathrm{I}_{0}}{8}$
$\mathrm{I}_{0} \frac{\text { Firet }}{\text { Polarizer }} \mathrm{I}_{0} / 2 \frac{\text { Malus law }}{\text { il polarizer }} \rightarrow\left(\frac{\mathrm{I}_{0}}{2}\right) \cos ^{2} 30^{\circ}$

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