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KCET2024PhysicsWave Optics

Three polaroid sheets are co-axially placed as indicated in the diagram. Pass axes of the polaroids 2 and 3 make 30^ and 90^ with pass axis of polaroid sheet 1 . If I₀ is the intensity of the incident unpolarised light entering sheet 1 , the intensity of the emergent light through sheet 3 is

Options

  1. Azero
  2. B3 I₀ 32
  3. C3 I₀ 8
  4. D3 I₀ 16

Correct answer

A. zero

Step-by-step solution

Intensity of polarised light passing through first polaroid, I₁=I₀ / 2 Intensity of light passing through second polaroid, I₂=I₁ ^2 = I₀ 2 ^2 30^ = 3 4 I₀ Intensity of polarised light transmitted through third polaroid, I₃=I₂ ^2 = 3 4 I₀ ^2 90^ = 3 4 I₀ 0=0

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