Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Single-slit diffraction and wave nature of light

  1. Nov 7, 2007 #1
    can someone explain me why single-slit diffraction occurs in terms of the electromagnetic interpretaition of light
  2. jcsd
  3. Nov 7, 2007 #2
    I assume that just means the wave interpretation of light. Well if you imagine an infinite number of point sources fill the slit, each one emitting radial waves. These interfere in such a way that a diffraction pattern is produced. Because the points are all located at different points in space there will be phase differences between the waves emitted from each point and hence diffraction occurs.
  4. Nov 7, 2007 #3
    actually that was more of hugyens principle interpretation i actually wanted to know why does the electric field propagation vector change direction?
  5. Nov 11, 2007 #4

    Claude Bile

    User Avatar
    Science Advisor

    The diffracted wave contains a different k spectrum because it now contains spatial information about the object that caused it to diffract. Smaller objects (or more correctly, their aperture function along a specific direction) contain more spatial frequency components in that direction, and thus result in a diffracted wave possessing a wider k spectrum.

    Since we usually speak of a monochromatic incident wave, the magnitude of k remains constant, thus a change in the components of k imply a change in direction of the wave.

  6. Nov 12, 2007 #5
    Diffraction is a phenomenon which envolves the bending of waves around obstacles. It's generally guided by Huygen's Principle, which states: every point on a wave front acts as a source of tiny wavelets that move forward with the same speed as the wave; the wave front at a later instant is the surface that is tangent to the wavelets.
    Last edited: Nov 12, 2007
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Single-slit diffraction and wave nature of light
  1. Single-slit diffraction (Replies: 14)