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Homework Help: Optics: Fringes and phase

  1. Nov 13, 2009 #1
    1. The problem statement, all variables and given/known data
    Hi all

    Please take a look at problem 35.61 in this PDF (it is on page 5): http://physics.wustl.edu/classes/SP2009/212/homework/YF35.pdf [Broken]

    What I can do is to find the "extra" phase accumulated in the glass rod per minute. But I do not know how to transform this into a number of fringes?
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Nov 13, 2009 #2
    Ok, I got the answer 22.7, which is also correct. I got it by finding

    (phase gained per minute) - (phase gained at T=20 degrees) / 2Pi.

    But this was pure luck - I cannot see, why this gives me the correct answer.
  4. Nov 14, 2009 #3
    Guys, I am sorry about doing this, but I really need help with this. This is such a fundemental thing that I must understand it. Can you give me a hand?
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