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At the first minimum adjacent to the central maximum of a single-slit diffraction pattern the phase difference between the Huygens wavelet from the edge of the slit and the wavelet from the mid-point of the slit is
A. `(pi)/(8)` radian
B. `(pi)/(4)` radian
C. `(pi)/(2)` radian
D. `pi` radian

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Correct Answer - D
image
For first minima path difference between A and C is `lamda` so path difference between A and B should be `lamda//2` and phase difference `pi`

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