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Consider Fraunhoffer diffraction pattern...

Consider Fraunhoffer diffraction pattern obtained with a single slit illuminated at normal incidence. At the angular position of the first diffraction minimum the phase difference (in radians) between the wavelets from the opposite edges of the slit is

A

`pi//4`

B

`pi//2`

C

`2pi`

D

`pi`

Text Solution

Verified by Experts

The correct Answer is:
C
The figure depicts Franhoffer diffraction pattern. For P to be first minimum, the phase difference between OA or OB is `pi`.
`therefore` Phase difference from opposite edges=2`pi` radian
.
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