Choose the one alternative that best completes the statement or answers the question. -A double-convex thin lens has radii of curvature of magnitude 46 cm, and it is made of glass

Choose the one alternative that best completes the statement or answers the question.
-A double-convex thin lens has radii of curvature of magnitude 46 cm, and it is made of glass of index of refraction 1.60. What is the focal length of this lens?
A) infinite
B) -19 cm
C) 38 cm
D) -30 cm
E) 18 cm

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