In a Newton’s-rings experiment, a plano-convex glass (n = 1.52) lens having diameter 10.0 cm is placed on a flat plate as shown in Figure 37.18a. When 650-nm light is incident normally, 55 bright rings are observed with the last one right on the edge of the lens.
(a) What is the radius of curvature of the convex surface of the lens?
(b) What is the focal length of the lens?