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Homework Help: Double slits experiment, wavelength calculation

  1. Jul 24, 2012 #1
    1. The problem statement, all variables and given/known data

    In a double slit experiment with slits 1. 10-5 m apart, light casts the first bright band 3.10-2 m from the center of a screen 0.65 m away what is the wavelength ?

    2. Relevant equations

    dsin(theta) = (m +1/2)lambda,

    3. The attempt at a solution

    I think to solve this problem I need the angle more to apply this formula

    dsin(theta) = (m +1/2)lambda,

    am I right, or maybe we can solve it without the angle ?

    Thanks in advance
  2. jcsd
  3. Jul 24, 2012 #2
    If you know the distance to the screen and the distance to the first fringe from the centre line then you have the angle information
  4. Jul 24, 2012 #3
    Yess sure, thank you.
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