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Double slit experiment doesn't work

  1. Dec 30, 2012 #1
    I took a piece of carton and cut out to strands in it. When I shine the line through it, it only projects the two strands on the other side. I tried it with every light in my house but it still didn't work. what do I have to do, to create the wave interference pattern on the other side.
    Thank you
  2. jcsd
  3. Dec 30, 2012 #2


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  4. Dec 30, 2012 #3


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    Staff: Mentor

    It's difficult to demonstrate two-slit interference with ordinary light sources because they're incoherent and emit a mixture of wavelengths. Have you tried a laser? A cheap laser-pointer should do the job OK.
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