A contact lens is in the shape of a convex meniscus (see Fig. 31.25). The inner surface is curved to fit the eye, with curvature radius 7.80mm. The lens is made from plastic with refractive index n = 1.56. If it has a 44.4-cm focal length, what?s the curvature radius of its outer surface?

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Plano- Double Convex convex convex meniscus 1) Plano- Double Concave concave concave meniscus FIGURE 31.25 Common lens types.