IGNOU PHE 9 2026 - Depict spatial evolution of Fresnel diffraction pattern.

Question

Depict spatial evolution of Fresnel diffraction pattern.

28 Jan 2026

Answer :

Word Count : 255

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 as the distance from the diffracting aperture changes.

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