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The drawing shows a cross section of a planoconcave lens resting on a flat glass plate. (A planoconcave lens has one surface that is a plane and the other that is concave spherical.) The thickness t is 1.37 × 10-5 m. The lens is illuminated with monochromatic light (λvacuum = 550 nm), and a series of concentric bright and dark rings is formed, much like Newton s rings. How many bright rings are there? |
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