Arago spot

Arago spot

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Credit: GIPhotoStock/SCIENCE PHOTO LIBRARY

Caption: Arago spot. Diffraction pattern for diffraction on a steel ball, as could be obtained with a purple laser. Note the bright spot, called Arago or Poisson spot, at the centre of the geometric shadow. Historically, observation of Arago spot was used as an evidence for the wave theory of light. Digital composite.

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Keywords: arago, arago spot, ball, beam, circle, circular, composite, diffract, diffraction, digital composite, geometric shadow, laser, laser beam, light, monochromatic, optical, optics, physics, poisson, poisson spot, purple, shape, spot, steel ball, violet

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