In a setup for observing Newton´s rings, a speck of dust with a diameter of D = 1.0 mm fell between the top of the spherical surface of the lens and the plate. At what distance from the center does the interference disappear if the rings are observed in the light with a spectral interval of 10 A and a wavelength of 5500 A? The radius of curvature R = 40 cm.
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