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Homework Help: Optics - Intensity

  1. Jan 13, 2008 #1
    1. The problem statement, all variables and given/known data

    Parallel rays of light pass of wavelength 540nm throught a 0.4mm slit. The intensity of the central maximum on a diffraction pattern 1.5m away is Io. At what distance from the central maximum does the intensity fall to Io/2?

    2. Relevant equations

    I = Io sin^2 (pi a y / lambda d) / (pi a y / lambda d)^2 (????)

    3. The attempt at a solution

    Okay, I worked out the distance from the central maximum to the first minimum to be
    2.03mm, so it's obviously less than that... beyond that, I'm stuck. Any ideas?
  2. jcsd
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