In a newtons ring experiment a plano- convex glass n 142, Physics

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In a newtons ring experiment a plano- convex glass n 142

In a Newton's ring experiment, a plano- convex glass (n = 1.42) lens having diame- ter 11.8 cm is placed on a flat plate as in the figure. When 682 nm light is incident normally, 7 bright rings are observed with the last one right on the edge of the lens, at r.

a) What is the radius of curvature of the convex surface of the lens?

b) What is the focal length of the lense?

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