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
radian
radian 
radian
radian
Text Solution
Verified by ExpertsA
The situation is shown in the figure.
In figure 
and 
represent the edges of the slit 
of width 
and 
represents the midpoint of the slit.
For the first minimum at 
The path difference between the wavelets from 
to 
is
The corresponding phase difference 
is
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