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The left face of a biconvex lens has a radius of curvature of 18.8 centimeter, and the right face has a radius of curvature of 15.8 centimeter. The index of refraction of the glass is 1.44.
Calculate what is the focal length of the lens.
Answer in units of cm.
Determine what is the focal length if the radii of curvature of the two faces are interchanged.
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