At the first minimum adjacent to the central maximum ofa 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
A
radian
B
radian
C
radian
D
radian
Text Solution
Verified by ExpertsThe correct answer is:
A
: The situation is shown in the figure.
In figure 
and 
represent the edges of the slit 
ofwidth 
and 
represents the midpoint of the slit.
For the first minimum at 
(i)
where 
is the wavelength oflight.
The path difference between the wavelets from 
to 
is
(using(i))
The corresponding phase difference 
is
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