Single slit diffraction

  1. I'm confused about the single slit diffraction pattern. Why are light and dark patterns? Where is the constructive and destructive interference occuring if there is just one wave?
     
  2. jcsd
  3. Drakkith

    Staff: Mentor

  4. So when doing the double slit experiment, one will see two diffraction patterns on top of each other then?
     
  5. vanhees71

    vanhees71 3,598
    Science Advisor
    2014 Award

    The most simple picture about diffraction comes from using the Fraunhofer case (both source and detection screen at infinity) and Kirchhoff's approximate formula. Then the diffraction pattern seen at the screen turns out to be given by the Fourier transform of the openings, i.e., the electric field is proportional to this Fourier transform.

    The physical picture behind this is that any point of the opening is the source of a wave, and at the infinitely far away screen you can approximate the spherical wave by a plane wave (Fraunhofer diffraction).

    You find the math in great detail at the Wikipedia link in GeneralOJB's posting.
     
  6. Drakkith

    Staff: Mentor

    I think he means my post. :wink:
     
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