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MHT CET202522 Apr 2025Evening ShiftPhysicsWave OpticsActual

Two polaroids are placed in the path of unpolarised beam of intensity ' I ₀ ' such that no light is emitted from the second polaroid. If a third polaroid whose polarisation axis makes an angle ' ' with the polarisation axis of first polaroid is placed between these polaroids then the intensity of light emerging from the last polaroid will be

Options

  1. AI₀ 4 ( 2 )^2
  2. BI₀ 8 ( 2 )^2
  3. CI ₀ 4 ^2
  4. DI₀ 8 ^2

Correct answer

B. I₀ 8 ( 2 )^2

Step-by-step solution

The given solution describes the intensity of light transmitted through a system of Polaroids. The first Polaroid (P1) is placed with its transmission axis vertical. The second Polaroid (P2) is placed such that its transmission axis is horizontal, making P1 and P2 crossed Polaroids. A third Polaroid (P3) is inserted between them at an angle to the vertical. When unpolarized light of intensity I₀ is incident on P1, the transmitted intensity is I₁ = I₀ 2 . The light then reaches P3, which is oriented at an angle to P

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