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Homework Help: Double-slit experiment (path length)

  1. Apr 23, 2012 #1
    1. The problem statement, all variables and given/known data

    In a double slit-experiment, how far apart do the path length differences have to be to get a pattern with adjacent constructive and destructive interference fringes?

    I have no clue how to even begin this problem.
  2. jcsd
  3. Apr 23, 2012 #2
    Does anyone know this? I really need to find out :(.
  4. Apr 24, 2012 #3
    Constructive interference occurs when Δλ is a whole integer(0(central maximum),1,2,3 etc..) and destructive interference occurs when Δλ is a whole integer + half (0.5, 1.5, 2.5 etc..)

    hope it helps out.
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