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The incident wavefronts in Fresnel and Fraunhofer Diffraction are respectively _________

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The incident wavefronts in Fresnel and Fraunhofer Diffraction are respectively _________

(a) Planar and Planar

(b) Planar and cylindrical

(c) Cylindrical and Planar

(d) Cylindrical and Cylindrical

I had been asked this question in exam.

Origin of the question is Differences of Fresnel and Fraunhofer Diffraction topic in portion Diffraction of Engineering Physics II

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Correct answer is (c) Cylindrical and Planar

Explanation: In Fresnel Diffraction the incident wavefronts are cylindrical whereas in Fraunhofer diffraction the incident wavefronts are parallel.

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