ii) Newton’s rings are formed in reflected light of wavelength 5890 10^-8cm with a liquid between the plane and curved surfaces. The diameter of the fifth ring is 0.3 cm and the radius of curvature of the curved surface is 100 cm. Calculate the refractive index of the liquid, when the ring is bright.

Newton's rings are a phenomenon of interference that occurs when a thin air film exists between a plano-convex lens (curved surface) and a flat glass plate (plane surface). The condition for constructive interference in these rings is given by:

2 * t * sqrt(R * lambda) = m * lambda

Where:

• t is the thickness of the air film
• R is the radius of curvature of the curved ________ _______ __________ __________ ______ __________ ______.
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