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The surface of calculation for Fraunhofer and Fresnel diffraction patterns are respectively __________

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in Engineering Physics II by (679k points)
The surface of calculation for Fraunhofer and Fresnel diffraction patterns are respectively __________

(a) Flat and Flat

(b) Spherical and Flat

(c) Flat and Spherical

(d) Spherical and Spherical

This question was posed to me in an interview.

My question is based upon Differences of Fresnel and Fraunhofer Diffraction in division Diffraction of Engineering Physics II

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Correct answer is (b) Spherical and Flat

The best explanation: The surface of the calculation for the Fraunhofer diffraction is spherical while for Fresnel Diffraction it is flat. Also, the observation distance for Fraunhofer diffraction is infinite while for Fresnel Diffraction is finite.

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