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How many slits for a discrete spectrum?

  1. Dec 7, 2016 #1
    1. The problem statement, all variables and given/known data

    I watched two videos on KhanAcademy, one was about light interference with 2 slits and the other was with 4 slits. The video with 2 slits got a continuous spectrum whereas the one with 4 slits got a discrete spectrum. So my question is: how many slits does it take to get a discrete spectrum and why that number specifically?

    2. Relevant equations


    3. The attempt at a solution
     
  2. jcsd
  3. Dec 8, 2016 #2

    Simon Bridge

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    Citation please.

    The spectra should be as discrete or continuous as the source.
    ie. if a white light source, the diffraction grating should result in a series of rainbow patterns.
     
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