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MHT CET202123 Sep 2021Evening ShiftPhysicsWave OpticsActual

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

Options

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

Correct answer

B. d^2 7 D

Step-by-step solution

Distance of 4^ th dark band from the centre =3.5 D d aligned & d 2 = 3.5 D d & = d^2 7 D aligned

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