For first minima
AP−BP=λ
AP−MP=2λ
So phase difference =λ2π×2λ=π
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:
Held on 30 Apr 2015 · Verified 9 Jul 2026.
2π radian
π radian
8π radian
4π radian
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