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A plano-convex lens is one with a convex surface on one side and a flat surface...

A plano-convex lens is one with a convex surface on one side and a flat surface on the other. Suppose a thin lens is made of glass with index of refraction 1.5. If the radius of curvature of the curved surface is 1.2 meters, what is the focal length of the lens? Give your answer in meters.

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