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Homework Help: Interference fringes in Young's experiment

  1. May 9, 2010 #1
    1. The problem statement, all variables and given/known data

    Explain why wider slits at the same spacing could produce fringes at the outer edges brighter than some of the fringes nearer the centre.

    2. Relevant equations

    fringe spacing = (lamda x D) / slit separation
    width of central diffraction fringe = ( 2 x lamda x D ) / aperture width

    3. The attempt at a solution
    I know that as a slit gets wider the amount of diffraction decreases. I also know that as distance away from the central fringe increases the intensity decreases. I can't put these ideas together to work out why there is brighter fringese further away when logic tells me otherwise.
    Last edited: May 9, 2010
  2. jcsd
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