Лаг1989 задача №20.29

A flat-convex glass lens with a radius of curvature of the spherical surface R = 12.5 cm is pressed against the glass plate. The diameter of a dark Newtonian ring in reflected light is 1 mm, the diameter of a dark ring, whose serial number is 5 units larger, is 1.5 mm. Determine the wavelength of light.

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