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Sharpeness of shadows as evidence for light motion

  1. Nov 30, 2015 #1
    How is the sharpness of shadows evidence for the propagation of light in a straight line ?
  2. jcsd
  3. Nov 30, 2015 #2


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    Gold Member

    It is a pretty straightforward question. How much thought have you given it?

    If light moved in squiggly lines what do you think the edges of shadows would look like?
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