Arago spot
nounEtymology Named after Dominique-François-Jean Arago, who performed an experiment demonstrating the spot's existence.
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Engineering, Natural sciences, Optics, Physical sciences, Physics A bright point that appears at the centre of a circular object's shadow due to Fresnel diffraction.
- 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.