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Fringe with of interference pattern

  1. Jan 28, 2008 #1
    1. The problem statement, all variables and given/known data
    Calculate the fringe width of an interference pattern created by two coherent source, 1mm apart and emitting light of wavelength 600 nm. the pattern is observed on a screen 50cm from the source

    2. Relevant equations
    x = dλ/a

    3. The attempt at a solution
    I don't know how to start...
     
    Last edited: Jan 28, 2008
  2. jcsd
  3. Jan 28, 2008 #2

    Hootenanny

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    Well you must have some idea since you know the equation.
     
  4. Jan 28, 2008 #3
    λ = wavelength, can you tell me what does x, d and a represent.
     
  5. Jan 28, 2008 #4

    Hootenanny

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    x represents the width of the fringe, d represents the distance between the slits and the screen; and a represents the slit separation. Surely you have a textbook and/or class notes?
     
  6. Jan 28, 2008 #5
    Thanks Hootenanny... I think I got it...

    d = 50cm , a = 1mm , λ = 600nm

    d = 50*10^-2m
    a = 1*10^-3m
    λ = 600*10^-9m

    = (600*10^-9*50*10^-2)/(1*10^-3)
    = 3*10^-4m
     
  7. Jan 28, 2008 #6

    Hootenanny

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    Looks good to me :smile:
     
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