A parallel beam of monochromatic light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of the incident beam. At the first minimum of the diffraction pattern, the phase difference between the rays coming from the two edges of the slit is
A
zero
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
: At the first minimum of the diffraction pattern, the rays coming from the two edges of the slit have a path difference 
and phase difference 
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