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Fresnel diffraction occurs when a wavefront encounters an obstacle or aperture and the source or observation point is at a finite distance, unlike Fraunhofer diffraction where both are effectively at infinity. The spatial evolution of a Fresnel diffraction pattern can be visualized by considering the successive positions of the observation screen ______ _______ ______ _______ _________ _____ ________ ________ _____ ___ ____ _________.
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