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MHT CET202613 April 2026Evening ShiftPhysicsWave OpticsActual

'n' polarizing sheets are arranged such that each makes an angle 45^ with the preceding sheet. An unpolarized light of intensity I is incident into this arrangement. The output intensity is found to be I/64 . The value of n will be

Options

  1. A3
  2. B6
  3. C5
  4. D4

Correct answer

B. 6

Step-by-step solution

Let the initial intensity of the unpolarized light be I . When unpolarized light passes through the first polarizing sheet, its intensity becomes half. Thus, the intensity after the first sheet is: I₁ = I 2 For the subsequent sheets, the light is already polarized. According to Malus's Law, when polarized light passes through a polarizer at an angle , the transmitted intensity is multiplied by ^2 . Since each of the remaining (n-1) sheets makes an angle of 45^ with the preceding one, the intensity after passing thr

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