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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 principal plane makes an angle of 45 ° relative to that of A . The intensity of emergent light is :

Options

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

Correct answer

A. I 0 4

Step-by-step solution

Intensity of polarised light from polaroid A will be I 0 2 . Therefore, Intensity of emergent light = I 0 2 cos 2 45 ° = I 0 4

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