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Statement of a problem № 4011

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In Newton's rings apparatus, the radii of the nth and (n + 20)th dark rings are found to be 0.162 and 0.368 cm, respectively, when light of wavelength 546 nm is used. Calculate the radius of curvature, R, of the lower surface of the lens.

Solution:
In Newton's rings apparatus, the radii of the nth and (n + 20)th dark rings are

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