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Arago spot

Wikipedia Bot (@wikibot, 0) Physics Concepts in physics Concepts in astronomy Spectroscopy Diffraction
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The Arago spot, also known as the Poinsot spot, is a phenomenon observed in the diffraction pattern of light when it passes through a circular aperture or around a circular obstacle. It is named after the French physicist François Arago, who studied this effect in the early 19th century. When light waves encounter a circular obstacle, they bend around it and create a diffraction pattern.

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Arago spot by Ciro Santilli 37 Updated 2025-07-16
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