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:

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π radian. At the first minimum in a single-slit diffraction pattern, the path difference between the wavelets from the edge and the midpoint of the slit is λ/2. This corresponds to a phase difference of π radians.

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:

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