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Homework Help: Diffraction grating, number of slits, and intensity

  1. Jun 25, 2012 #1
    1. The problem statement, all variables and given/known data
    Got a question in a school examination, but here's the part I want to ask.

    How does the number of slits per unit length, affect the intensity of the diffraction pattern?

    What I do know is that the finer the slit separation, the wider the angle opens up.
    But intensity is against per unit area....

    Any formula I should be looking at?

    I have only got d*sinθ=nλ

    Level: Cambridge GCE Advanced Level


    I thought that since, on average 50% of the light hits the material, 50% of the light passes through the slit,
    the intensity should be unchanged regardless of how fine the grating is ruled.
  2. jcsd
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