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B Are vertical lines from squinting a Quantum phenomenon?

  1. May 2, 2017 #1
    When looking at a night light with almost closed eyes, I notice that the light becomes a vertical line. When tilting my head 90 degrees, the line becomes horizontal.

    Can this be explained by Heisenberg's Uncertainty principle?

    This question has been asked in another thread : "Squinting at light bulbs, what are those lines?", but it is closed for comments.

    The poster mentions interference patterns and the double slit experiment.

    I have seen videos where a laser is pointed at a narrow vertical slit and the pattern on the wall beyond is a horizontal line.
  2. jcsd
  3. May 2, 2017 #2


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    Staff: Mentor

    That's not a quantum mechanical phenomenon, it's classical diffraction of the light waves.
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