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At the first minimum adjacent to the cen...

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/2` radian

B

`pi radian `

C

`pi/8` radian

D

`pi/4` radian

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