Question: A common interference setup for seeing Newton's rings consists of a plano-convex lens placed on a plane mirror and illuminated from above at normal incidence

A common interference setup for seeing Newton's rings consists of a plano-convex lens placed on a plane mirror and illuminated from above at normal incidence with monochromatic light. In an experiment using a plano-convex lens with local length f = 80.00 cm and index of refraction n1 = 1.500, the radius of the third bright circle is found to be 0.8487 mm. Determine the wavelength of the monochromatic light.

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