A lens is made of glass having an index of refraction of \( 1.5 \). One side of the lens is flat...

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A lens is made of glass having an index of refraction of \( 1.5 \). One side of the lens is flat, and the other is convex with a radius of curvature of \( 20 \mathrm{~cm} \).
Find the focal length of the lens.
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