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In df online bingo optics, an Arago spot is a bright point which, owing to diffraction, appears at the center of the shadow of a circular object in light from a point source. The diffraction pattern of a circular object has considerable interest df online bingo due to the historical part it played in the wave theory of light. Simeon Poisson Poisson deduced from Augustin df online df online bingo bingo Fresnels theory the necessity of a bright spot at the centre of the shadow of a circular opaque obstacle. With this counterintuitive result Poisson hoped to disprove the wave theory; however df online bingo Dominique Arago experimentally verifed the prediction and today the demonstration df online bingo goes by the name "Simeon Poisson spot." Optics