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MHT CET20227 Aug 2022Evening ShiftPhysicsWave OpticsActual

In biprism experiment, the wavelength is used to obtain an interference pattern. Then fringe width is W ₁ at distance D ₁ from the screen when the screen is moved towards biprism, fringe width becomes W ₂ at distance D ₂ The distance between two virtual images of the slit is

Options

  1. A(D₂-D₁ ) (W₁-w₂ )
  2. B( W ₁- W ₂ ) ( D ₁- D ₂ )
  3. C( W ₂- W ₁ ) ( D ₁- D ₂ )
  4. D( D ₁- D ₂ ) ( W ₁- W ₂ )

Correct answer

D. ( D ₁- D ₂ ) ( W ₁- W ₂ )

Step-by-step solution

Fringe width = D d W ₁= D ₁ ~d w ₂= D ₂ ~d aligned & w = w ₁- w ₂ & = d ( D ₁- D ₂ ) & d = ( D ₁- D ₂ ) ( w ₁- w ₂ ) aligned

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