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Dark fringe wave question

  1. Jul 29, 2012 #1
    I can vaguely remember a question i saw a few weeks ago, but it was multi choice and about identifying a hair follicle a circular aperture was used and dark fringe.

    It went like: A hair follicle was found at the scene of a crime where they used a circular aperture at distance of 1m and angle 45(not sure if included). Whos hair was it;

    A sam: 144nm
    B greg: 133nm
    C george: 120nm
    D sean: 166nm


    These arent real values and im sorry about it being so vague, but if you know of a similar question and the method please tell me!!!
  2. jcsd
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