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MHT CET202611 April 2026Morning ShiftPhysicsWave OpticsActual

Two polaroid A and B placed in such a way that the pass-axis of polaroid are perpendicular to each other. Now, another polaroid C is placed between A and B bisecting angle between them. If intensity of unpolarised light is I₀ then intensity of transmitted light after passing through polaroid B will be

Options

  1. AI₀ 4
  2. BI₀ 2
  3. CI₀ 8
  4. Dzero

Correct answer

C. I₀ 8

Step-by-step solution

Intensity of light after passing through polaroid A is I_A = I₀ 2 Angle between the pass-axis of polaroid A and C is ₁ = 45^ Intensity of light after passing through polaroid C is I_C = I_A ^2(45^ ) = I₀ 2 ( 1 2 )^2 = I₀ 4 Angle between the pass-axis of polaroid C and B is ₂ = 45^ Intensity of light after passing through polaroid B is I_B = I_C ^2(45^ ) = I₀ 4 ( 1 2 )^2 = I₀ 8 Answer: I₀ 8

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