411 REFERENCE · Wiktionary
Arago spot
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Etymology
Named after Dominique-François-Jean Arago, who performed an experiment demonstrating the spot's existence.
Noun
en optics A bright point that appears at the centre of a circular object's shadow due to Fresnel diffraction.
en Fresnel spot Poisson spot
en 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.
en eponyms