At the first minimum adjacent to the central maximum of

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At the first minimum adjacent to the central maximum of a single-slit diffraction pattern, the phase difference between the Huygen's wavelet from the edge of the slit and the wavelet from the midpoint of the slit is :

1. π radian
  2
2. π radian
3. π radian
  8
4. π radian
  4

Correct Option: B

For first minima at P
AP - BP = λ

AP - MP =	λ
	2

So phase difference,

φ =	2π	×	λ	= π radian
	λ		2