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Width of principle maxima in n slit diffraction

  1. Oct 16, 2015 #1
    I was working on derivation to find the witdh of priciple maxima in n slit diffraction
    Angular width=2Δθm=2λ/(Ndcosθm)
    Where d:distance between slits
    θm:angle at which mth order principle maxima is present.
    N:no. Of slits

    #in the diagram given below why the minima just adjacent to mth pricinple maxima is written as mN±1
    *the thing I know is that this mN±1 is related to the fact that there are N-1 minimas present b/w 2 consecutive principle maximas
    How that I 'm not able to relate it?

    Attached Files:

  2. jcsd
  3. Oct 16, 2015 #2


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    Hi there,

    Please don't delete the template but use it. If not for you, then for those of us who want to help.

    Hyperphysics has an expression for the intensity. You can derive the widths from that.
  4. Oct 17, 2015 #3
    My actual doubt is how that mN±1 came ?
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