Physics II Lab w answers_Part_57

Physics II Lab w answers_Part_57 - Experiment 21 Newtons...

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125 Experiment 21 Newton’s Rings Apparatus: Traveling microscope, sodium vapour lamp, plano-convex lens, plane glass plate, magnifying lens. Purpose of the experiment: To observe Newton rings formed by the interface of produced by a thin air film and to determine the radius of curvature of a plano-convex lens. Basic Methodology: A thin wedge shaped air film is created by placing a plano-convex lens on a flat glass plate. A monochromatic beam of light is made to fall at almost normal incidence on the arrangement. Ring like interference fringes are observed in the reflected light. The diameters of the rings are measured. I. Introduction: I.1 The phenomenon of Newton’ s rings is an illustration of the interference of light waves reflected from the opposite surfaces of a thin film of variable thickness. The two interfering beams, derived from a monochromatic source satisfy the coherence condition for interference. Ring shaped fringes are produced by the air film existing between a convex surface of a long focus plano-convex lens and a plane of glass
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Physics II Lab w answers_Part_57 - Experiment 21 Newtons...

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