A double-convex lens is to be made of glass with an index of refraction of \( 1.5 \). One surfac...

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A double-convex lens is to be made of glass with an index of refraction of \( 1.5 \). One surface is to have \( 1.5 \) times the radius of curvature of the other and the focal length is to be \( 60 \mathrm{~mm} \). What is the (a) smaller and (b) larger radius?
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