The solution of the problem 3.29 cr 3 from the problem

The solution of the problem 3.29 cr 3 from the problem

PROBLEM 3.29
The installation for observing Newton´s rings is illuminated by monochromatic light falling normally. The wavelength of light is 0.5 μm. Find the radius of curvature of the lens if the diameter of the fourth dark ring in reflected light is 8 mm.

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