The drawing shows a cross section of a planoconcave lens
Chapter , Problem 20(choose chapter or problem)
The drawing shows a cross section of a planoconcave lens resting on a fl at 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 3 1025 m. The lens is illuminated with monochromatic light (lvacuum 5 550 nm), and a series of concentric bright and dark rings is formed, much like Newtons rings. How many bright rings are there? (Hint: The cross section shown in the drawing reveals that a kind of air wedge exists between the place where the two pieces of glass touch and the top of the curved surface where the distance t is marked.)
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