Large objects, for instance a tree, can cast shadows. Do elementary partices such as photos cast shadows. And can this be proven?

  • $\begingroup$ No, because photons just pass right through each other. $\endgroup$ – knzhou Nov 6 '19 at 20:20
  • $\begingroup$ Isn't this debatable since super high energy photons can crash into low energy photons? $\endgroup$ – toaster_fan Nov 6 '19 at 20:23
  • $\begingroup$ This can happen very rarely, but I thought you were asking about things that happen in practice, i.e. a real shadow you could actually see. $\endgroup$ – knzhou Nov 6 '19 at 20:25
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    $\begingroup$ Minute physics youtube. youtu.be/Fv1JJ227CQk $\endgroup$ – BowlOfRed Nov 6 '19 at 20:38

No. The casting of shadows is caused by the absorption and/or reflection of light. Generally light does not absorb or reflect itself. Photon photon scattering is possible and has been detected under extreme conditions at CERN, but it is not a manifest phenomenon in everyday conditions.

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