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The expression for the radius of the nth dark ring is given as rn2 = n R l

Here l is the wavelength of monochromatic source.

R- the radius of curvature of the plano convex lens

n is the order of the ring.

Theoretically we can get value of R knowing other quantities.

But practically we use the following expression

R = r n+m 2 - r n 2 / m l

This would reduce the error due to non symmetry of the smaller rings.

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