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A beam of unpolarised light of intensity I 0 is passed through a polaroid A and then through another polaroid B which is oriented so that its principle plane makes an angle of 45 o relative to that of A . The intensity of the emergent light is:

Options

  1. AI 0 4
  2. BI 0 8
  3. CI 0
  4. DI 0 2

Correct answer

A. I 0 4

Step-by-step solution

Relation between intensities is I R = I 0 2 cos 2 45 o = I 0 2 × 1 2 = I 0 4

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