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

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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
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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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