Question: A sapphire lens ( n = 1 . 7 7 ) has one concave side of radius of curvature 2 8 cm and a convex

A sapphire lens (n=1.77) has one concave side of radius of curvature 28 cm and a convex side of radius of curvature 19 cm. What is the focal length of the lens? (Include the proper sign)

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