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Homework Help: Dark and Bright Fringes

  1. Nov 12, 2015 #1
    1. The problem statement, all variables and given/known data

    Light passing through a two-slit grating makes a pattern on a screen located 500 mm away. In this pattern, the fifth-order dark fringe is 45.0 mm from the central bright fringe. How far from the central bright fringe is the third-order bright fringe?

    2. Relevant equations
    This is what I'm looking for help on.

    3. The attempt at a solution
    I'm not even sure which equations to use to solve this. Any ideas?
  2. jcsd
  3. Nov 12, 2015 #2


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    Science Advisor

    You got a textbook you are working with? Is there a section on two slit interference (aka Young's double slit experiment)? What equation does it give there?
  4. Nov 12, 2015 #3
    it's not in my book. any ideas?
    How do i go about this with a dark fringe and a bright fringe if i don't know the wavelength or slit width?

    GOT IT.
    Last edited: Nov 12, 2015
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