A glass lens, one surface of which is spherical with radius R = 8.6 m, and the second is flat, is placed with its convex side on a flat glass plate. When illuminated from above by a parallel beam of monochromatic light incident perpendicular to a flat plate, an interference pattern in the form of alternating dark and light rings (Newton's rings) is observed in the reflected light. Determine the wavelength of light if the radius of the fourth dark ring is r=4.5 mm.
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