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Air wedge problem solving (single interference)

  1. Oct 29, 2011 #1
    1. The problem statement, all variables and given/known data

    8 bright fringes are counted across 1.06 cm in the air wedge.



    2. Relevant equations


    Δx = L (λ/2t)



    3. The attempt at a solution

    i don't understand whether Δx is:

    8Δx = 1.06cm

    or
    7Δx = 1.06cm

    it said 8 bright fringes but Δx = the distance between dark fringes

    which one is the correct one?

    * if you were draw a diagram of the single interference pattern
    ex. 3 dark fringes

    is it:

    bright | dark | bright | dark | bright | dark | bright

    if this is correct, does it mean # of bright fringes are always 1 greater than the dark fringes?
     
  2. jcsd
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