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Question 20236
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Electromagnetic Waves and Wave Optics: Two Polaroids — Crossed MCQ

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Two Polaroids — CrossedEasyQuestion 20236

Question

Intensity after two crossed polaroids (transmission axes at 90°) is:
  1. A
    I₀/2
  2. B
    I₀/4
  3. C
    I₀
  4. D
    Zero
    Correct

Correct answer

Zero

Explanation

First polaroid transmits I₀/2 with polarisation at 0°. Second polaroid at 90° → Malus: I = (I₀/2) cos²90° = 0.

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