GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
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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