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Two polaroids are crossed. If now one of them is rotated through an angle of 30 ° and unpolarised light of intensity I 0 is incident on the first polaroid, then the intensity of transmitted light will be

Options

  1. AI 0 4
  2. B3 I 0 4
  3. C3 I 0 8
  4. DI 0 8

Correct answer

D. I 0 8

Step-by-step solution

Intensity through first polaroid, I 1 = I 0 2 ∴ Intensity of transmitted light, I = I 1 cos 2 θ = I 0 2 cos 2 ( 90 o - 30 o ) = I 0 2 cos 2 60 o = I 0 8

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