A) Source is at infinite distance and the incident beam has converged at the slit
B) Source is near to the slit and the incident beam is parallel
C) Source is at infinity and the incident beam is parallel
D) Source is near to the slit and the incident beam has converged at the slit
Correct Answer: B
Solution :
For Fraunhofer diffraction, incident: beam should be parallel. This can be achieved when [a] source is placed at focus of converging lens. [b] source is at infinite distance.
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