Evaluate the wavelength of the light, Physics

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A plano - convex lens of radius of curvature 2.5 m is placed on an optically plane glass plate in air medium and a parallel beam of monochromatic light is incident normally on the set up to observe the Newton's rings. The diameter of the 5th bright ring as seen by the reflected light is 0.70 cm. Evaluate the wavelength of the light used.


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