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Homework Help: Basic physics problem

  1. Sep 28, 2005 #1
    A plano-convex glass lens of radius of curvature 1.8 m rests on an optically flat glass plate. Before the lens is placed on the plate a film of oil of refractive index 1.78 is deposited on the plate. The arrangement is illuminated from above with monochromatic light of 480-nm wavelength. The indexes of refraction of the lens and plate are 1.5. The radius r of a fringe is related to the thickness t of the film and the radius of curvature R of the lens through r = (2tR)^1/2. What are the radii of the first and second fringes?

    How do you determine t?
  2. jcsd
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