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MHT CET202617 April 2026Evening ShiftPhysicsWave OpticsActual

An unpolarised light of intensity 64 Wm ⁻² passes through three polarizers successively such that the transmission axis of last polarizer is crossed with the first. The intensity of the emerging light is 6 Wm ⁻² . The angle between the transmission axis of the first two polarizers is

Options

  1. A1 2 ⁻¹ ( 3 2 )
  2. B1 2 ⁻¹ ( 3 2 )
  3. C1 2 ⁻¹ ( 1 3 )
  4. D1 2 ⁻¹ ( 1 3 )

Correct answer

A. 1 2 ⁻¹ ( 3 2 )

Step-by-step solution

Let the intensity of the unpolarized light be I₀ = 64 Wm ⁻² . When unpolarized light passes through the first polarizer, its intensity becomes I₁ = I₀ 2 = 32 Wm ⁻² . Let the angle between the transmission axis of the first and second polarizers be . The intensity of light after the second polarizer is I₂ = I₁ ^2 = 32 ^2 . Since the third polarizer is crossed with the first, the angle between the transmission axis of the first and third polarizers is 90^ . Therefore, the angle between the transmission axis of the se

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