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Slit width order of wavelength

  1. Feb 22, 2012 #1
    In diffraction why the slit width has to be the order of wavelength of wave? I dont understand. The smaller the width of the slit i think the more effective diffraction becomes.
    Why the width has to be order of the wavelength?
  2. jcsd
  3. Feb 24, 2012 #2

    Claude Bile

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    Science Advisor

    It doesn't. It can be much smaller or much larger. Diffraction theory can easily account for both.

    Look up "Kirchoff integral theorem".

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