Arago spot
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English
Etymology
Named after Dominique-François-Jean Arago, who performed an experiment demonstrating the spot's existence.
Noun
Arago spot (plural Arago spots)
- (optics) A bright point that appears at the centre of a circular object's shadow due to Fresnel diffraction.
- Synonyms: Fresnel spot, Poisson spot
- The Arago spot played an important role in the discovery of the wave nature of light and is a common way to demonstrate that light behaves as a wave.