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Q.

Find the right condition for Fraunhofer diffraction due to a single slit. 

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a

Source is near to the slit and the incident beam is parallel

b

Source is near to the slit and the incident beam has converged at the slit.

c

Source is at infinity and the incident beam is parallel.

d

Source is at infinite distance and the incident beam has converged at the slit.

answer is C.

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Detailed Solution

The source is at infinity and incident beam is parallel. In Fraunhofer diffraction the source and the screen should be at infinite distances from the slit.

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