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Homework Help: Single Slit diffraction

  1. Apr 19, 2007 #1
    1. The problem statement, all variables and given/known data
    A diffraction pattern is produced on a screen 130 cm from a single slit, using monochromatic light of wavelength 460 nm. The distance from the center of the central maximum to the first-order maximum is 2.20 mm. Calculate the slit width. (Hint: Assume that the first-order maximum is halfway between the first- and second-order minima.)

    2. Relevant equations

    y1 = L sin (theta) = L (wavelength / a)

    3. The attempt at a solution

    wavelength = 460 e -9 m
    L = .13 m
    y = .0022 m
    so I found a

    .0022 = .13 sin (theta)
    sin (theta) = .0169 = (wavelength/ a)

    a = .0272 mm

    How anyone tell me what I am doing wrong?
  2. jcsd
  3. Apr 19, 2007 #2


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    Staff Emeritus
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    Gold Member

    [tex]130\;cm \neq 0.13\;m[/tex]

  4. Apr 19, 2007 #3
    oops :) my bad
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