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Homework Help: Single Slit

  1. Oct 30, 2013 #1
    1. The problem statement, all variables and given/known data

    You want to photograph a circular diffraction pattern whose central maximum has a diameter of 1.2cm . You have a helium-neon laser (λ=633nm) and a 0.13-mm-diameter pinhole. How far behind the pinhole should you place the viewing screen?

    2. Relevant equations

    Y = λx/b
    Y=radius of central maximum
    b= slit diameter
    x=distance from screen

    3. The attempt at a solution

    x=1.23m <--- This answer is wrong. I don't know why.
  2. jcsd
  3. Oct 30, 2013 #2


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    Homework Helper

    The equation does not hold for a circular aperture. See http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/cirapp2.html#c2 or check your lecture notes.

    Y =1.22 λx/b

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