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Fraunhofer diffraction

Fraunhofer diffraction

"Fraunhofer diffraction" means a diffraction phenomenon where both an electron source and an observation point are located infinitely far from an object, thus both incident and exit waves can be regarded as plane waves. When an object is illuminated with a parallel incident beam, a diffraction pattern formed on the back focal plane of the objective lens is called a Fraunhofer diffraction pattern.

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