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The drawing shows a cross section of a plano-concave lens resting on a flat glass plate. (A plano-concave lens has one surface that is a plane and the other that is concave spherical.) The thickness t is 1.38 10-5 m. The lens is illuminated with monochromatic light (λvacuum = 535 nm), and a series of concentric bright and dark rings is formed, much like Newton's rings. How many bright rings are there?

I have been using the equation t=n(lambda)/2.... but it says im wrong. help?

  • Physics -

    just keep thinking you can figure it out it is a college course so i cant help you.

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