Choose the one alternative that best completes the statement or answers the question. -A double-convex lens made of glass having a refractive index of 1.50 has a radius of magnitude 40

Choose the one alternative that best completes the statement or answers the question.
-A double-convex lens made of glass having a refractive index of 1.50 has a radius of magnitude 40 cm on the front side and one of magnitude 30 cm on the back side. What is the focal length of this
Lens?
A) 11 cm
B) 80 cm
C) 34 cm
D) -11 cm
E) -240 cm

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