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Everyday quantum effects

  1. Nov 1, 2011 #1
    The house where I live has a wall made of bamboo slats. There are small square holes between the slats, but when light shines through the square holes onto a surface the shape is always round. Why is that?
  2. jcsd
  3. Nov 1, 2011 #2

    Jano L.

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    What size do these holes have?
  4. Nov 1, 2011 #3

    Oh, a few millimeters on a side. There's no chromatic aberration.
  5. Nov 1, 2011 #4


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    This has nothing to do with quantum effects. Each hole is acting like a pinhole camera, and the "round" patch of light is an image of the sun.
  6. Nov 1, 2011 #5
    It depends how big the holes are and how far away the imaging surface is. It could be a pinhole camera effect or it could be simple diffraction if the distance is far enough, both of which are classical wave effects. For instance, a water wave in the ocean flowing passed a square obstacle will have a square hole in its wavefront at first, but that will quickly disappear.
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