1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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.

    User Avatar
    Gold Member

    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


    User Avatar
    Science Advisor
    Homework Helper

    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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook