A parallel monochromatic beam of light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of incident beam. At the first maxima of the diffraction pattern, the phase difference between the rays coming from the edges of the slit is:
A
0
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
The phase difference 
between the wavelets from the top edges and th 
bottom edges of the slit is
where, 
is the slit width.
The first minima of the diffraction pattern occurs at
So, 
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