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MHT CET20244 May 2024Evening ShiftPhysicsWave OpticsActual

In a biprism experiment, monochromatic light of wavelength ' ' is used. The distance between the two coherent sources ' d ' is kept constant. If the distance between slit and eyepiece ' D ' is varied as D ₁, D ₂, D ₃, D ₄ and corresponding measured fringe widths are W ₁, ~W ₂, ~W ₃, ~W ₄ then

Options

  1. AW ₁ D ₁= W ₂ D ₂= W ₃ D ₃= W ₄ D ₄
  2. BW ₁ D ₁ = W ₂ D ₂ = W ₃ D ₃ = W ₄ D ₄
  3. CW ₁ D ₁ = W ₂ D ₂ = W ₃ D ₃ = W ₃ D ₃
  4. DD ₁ ~W ₁ = D ₂ ~W ₂ = D ₃ ~W ₃ = D ₄ ~W ₄

Correct answer

B. W ₁ D ₁ = W ₂ D ₂ = W ₃ D ₃ = W ₄ D ₄

Step-by-step solution

array ll & Fringe width W = D d & W D = d & W D = constant, as and d are constant & W ₁ D ₁ = W ₂ D ₂ = W ₃ D ₃ = W ₄ D ₄ array

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