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Newton's Rings

  1. Oct 4, 2008 #1
    1. Show that for t<<R, the radius r of a fringe is related to r= (2TR)^1/2

    I'm not sure what the relevant equations are, that would be the problem. A gentle shove in the right direction would be appreciated, I've been looking for exactly how to prove it and I can't. ^_^ Thanks for any help!
  2. jcsd
  3. Oct 4, 2008 #2

    Doc Al

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    Staff: Mentor

    This relationship is true in general, not just for fringes. Examine the geometry of the Newton's rings set up: A spherical convex lens placed upon a flat piece of glass. Draw a diagram with the quantities r, t, and R indicated.
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