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Circular aperture diffraction

  1. Apr 5, 2009 #1
    1. The problem statement, all variables and given/known data

    A beam of yellow laser light (580 nm) passes through a circular aperture of diameter 4 mm. What is the angular width of the central diffraction maximum formed on a screen? (Define the angular width as the full angle from one minimum of the central diffraction maximum to the diametrically opposite minimum.)


    2. Relevant equations

    sinθ=1.22(λ/d)

    θ = angle to first minimum
    λ = wavelength
    d = diameter of aperture

    3. The attempt at a solution

    This problem seems to be fairly straightforward, but I'm not coming up with the correct answer. Convert λ to mm to get .00058, divide by 4, and then multiply by 1.22. This value is equal to sinθ, so simply take sin-1 of that number to get θ. Computer does not like this answer. Help, anyone? Thanks in advance!
     
  2. jcsd
  3. Apr 5, 2009 #2
    LOL. Disregard. Realized correct answer moments after posting. Thanks anyways!
     
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