• Question: "I send a single photon through a thin slit. Tell me the exact point where this photon will hit a screen after the slit"

    Asked by tomellison to Angeline, Catherine, Luke, Philip, Shona on 18 Mar 2015.
    • Photo: Shona Whittam

      Shona Whittam answered on 18 Mar 2015:

      I don’t think you can predict where it will hit the screen.

    • Photo: Philip Moriarty

      Philip Moriarty answered on 18 Mar 2015:

      Another great question. Angeline is completely correct. You can’t predict where *exactly* it will hit the screen. This video shows what happens for single electrons in a double slit experiment. The same is true for single photons. https://www.youtube.com/watch?v=jvO0P5-SMxk

      It’s an absolutely fascinating video.

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