How Newton’s rings are used to determine wavelength of Monochromatic light?
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To determine the wavelength of sodium light by Newton's ring. ... Formula used : The wavelength λ of light is given by the formula: Where, Dn+m = diameter of (n+m)th ring, Dn = diameter of nth ring, m = an integer number (of the rings) R = radius of curvature of the curved face of the plano-convex
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(i) The Newton's ring experiment can be also used to find the wavelength of a monochromatic light. In this case, the radius of curvature of the convex surface of the given lens is supplied or is determined otherwise. By employing sodium light whose mean wavelength is 5893Å, R can be determined from Eqn.
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