IGNOU BPHCT 137 2026 - Depict spatial evolution of Fresnel diffraction pattern.

Question

Depict spatial evolution of Fresnel diffraction pattern.

19 Jan 2026

Answer :

Word Count : 269

Fresnel diffraction occurs when a wavefront encounters an obstacle or aperture and the distance between the aperture and the observation screen is finite, unlike Fraunhofer diffraction where the screen is effectively at infinity. In Fresnel diffraction, the wavefront curvature plays a significant role, and the diffraction pattern evolves spatially as the distance from the diffracting aperture changes. The spatial evolution of the Fresnel diffraction pattern can be understood using the concept of Fresnel zones, which divide the wavefront

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