Choose the one alternative that best completes the statement or answers the question. -A double-convex lens is formed from a piece of plastic with an index of refraction of 1.70. The

Choose the one alternative that best completes the statement or answers the question.
-A double-convex lens is formed from a piece of plastic with an index of refraction of 1.70. The radius of the front surface has magnitude 20 cm, and the radius of the back surface has magnitude
30 cm. What is the focal length of this lens?
A) 17 cm
B) -17 cm
C) -86 cm
D) 43 cm
E) 86 cm

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