Fresnel diffraction
Fresnel diffraction
"Fresnel diffraction" means a diffraction phenomenon where either of an electron source and an observation point or both of them located at a finite distance from an object, thus the incident wave or exit wave cannot be regarded as a plane wave. The Fresnel diffraction phenomenon is observed as an interference fringe (Fresnel fringe) appearing at the shadow part of the object by slightly shifting the focus of the objective lens.
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