Find the right condition(s) for Fraunhoffer diffraction due to a single slit.

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

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

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Source is at infinity and the incident beam is parallel.

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

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Solution

The correct options are
B Source is near to the slit and the incident beam is parallel.
C Source is at infinity and the incident beam is parallel.
In Fraunhoffer diffreaction, the source has to be kept at infinite distance effectively from the slit due to which the incident rays are parallel. This can be achieved if
(i)Point source is kept at the focus of a converging lens
(ii)Point source is at infinite distance

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