Arago spot
BRIGHT POINT THAT APPEARS AT THE CENTER OF A CIRCULAR OBJECT'S SHADOW DUE TO FRESNEL DIFFRACTION
Poisson spot; Poisson's Spot; Poisson's spot; Spot of Arago; Spot of arago; Poisson Spot; Poisson’s spot; Poisson's bright spot; Poisson bright spot; Fresnel bright spot
In optics, the Arago spot, Poisson spot, or Fresnel spot"Although this phenomenon is often called Poisson's spot, Poisson probably was not happy to have seen it because it supported the wave model of light. The spot is sometimes called Fresnel's spot because it is a direct consequence of his work, and Arago's spot because Arago devised the experiment that confirmed its existence.