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Electromagnetic Waves and Wave Optics: Unpolarised Light Through Polariser MCQ

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Unpolarised Light Through PolariserEasyQuestion 20222

Question

When unpolarised light passes through a single polariser, the transmitted intensity is:
  1. A
    I₀
  2. B
    2I₀
  3. C
    I₀/2
    Correct
  4. D
    I₀/√2

Correct answer

I₀/2

Explanation

Unpolarised light has all polarisation directions equally. On average, cos²θ averaged over all θ = 1/2. So I_transmitted = I₀/2. The polariser creates plane-polarised light at half the original intensity.

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