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Working with Wedge Fringes

  1. Mar 13, 2006 #1
    For a solid wedge of material of length L and maximum width D (ie, a triangle) how would one obtain an equation for /\x, the distance between dark fringes?

    For wedge fringes, how come the fringe at the narrow end is always dark?
  2. jcsd
  3. Mar 13, 2006 #2

    Doc Al

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    Staff: Mentor

    You need to consider two factors that determine the phase difference--and thus the interference--between the reflections at each boundary:

    What is the phase change upon reflection?

    What distance does the light travel in passing (twice) through the wedge?​
    Read up with these factors in mind.
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