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Help me in michelson interferometer

  1. Feb 14, 2009 #1
    1. The problem statement, all variables and given/known data

    Find the angular radius of the tenth bright fringe in a Michelson interferometer
    when the central-path difference (2d) is (i) 1.50 mm and (ii) 1.5 cm.
    Assume the orange light of a krypton arc is used and that the interference is
    adjusted in each case so that the first bright fringe forms a maximum at the
    centre of the pattern.

    2. Relevant equations

    2d sin theta = m lambda or
    2d cos theta= m lamda

    3. The attempt at a solution
    i confuse to use the equation.

    theta= cos-1 or sin -1 (6057 armstrong x 10th) divide 1.50mm
    the answer that i get is not logic.
  2. jcsd
  3. Feb 14, 2009 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    I'm unaware of circular fringes being produced in a Michelson interferometer. Ideally, there either is or isn't light at the detector or screen.

    Is there any more information given in the problem statement?
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