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MHT CET20228 Aug 2022Evening ShiftPhysicsWave OpticsActual

In biprism experiment, the 4^ th dark band is formed opposite to one of the slits. The wavelength of light used is ( D = distance between source and screen, d = distance between the slits)

Options

  1. Ad ^2 9 D
  2. Bd^2 11 D
  3. Cd^2 14 D
  4. Dd ^2 7 D

Correct answer

D. d ^2 7 D

Step-by-step solution

Concept: In biprism experiment, location of the nth dark band is the location of the nth dark fringe given by, y_n=(2 n-1) D 2 d Given, slit width = d , and y ₄= d 2 aligned & y ₄= ( 7 D 2 ~d )= ( d 2 ) & = ( d ^2 7 D ) aligned Option (D) is correct.

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