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COMEDK2016PhysicsWave Optics

In Young's double slit experiment, 1st dark fringe occurs directly opposite to a slit. Wavelength of light used is

Options

  1. Ad² / D
  2. Bd / D
  3. CD² / d
  4. D2 d² / D

Correct answer

A. d² / D

Step-by-step solution

For dark fringe, path difference, x= (n+ 1 2 ) Also, x= d y D d y D = (n+ 1 2 ) For 1st dark fringe at directly opposite point of slit n=0, y= d 2 d ( d 2 ) D = 2 = d² D

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