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Homework Help: Finding maximum in interference pattern

  1. Nov 19, 2014 #1
    1. The problem statement, all variables and given/known data
    In a three-slit system, the first minimum occurs at an angular position of 5.00°. Where is the first maximum?

    2. Relevant equations
    dsinθ = mλ/N

    3. The attempt at a solution
    dsin5° = λ
    dsinX = λ/3
    sinX = 3sin5°
    X = 1.66°

    I'm not sure if this is the right equation to find the first maximum in the interference pattern. Also, is the maximum the bright region and the minimum the dark region? Thanks all.
  2. jcsd
  3. Nov 20, 2014 #2


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    Homework Helper

    I get 15,2o when I solve for X?
    But your approach is correct, yes.
    And yes, the maximum (intensity) is the bright region
    and the minimum (intensity of light) is the dark region.
  4. Nov 20, 2014 #3
    Oh geez, what a silly mistake of dividing by three instead of multiplying by three... :confused: Thanks for the feedback.
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