Choose the one alternative that best completes the statement or answers the question. -What is the power of the lens that has a focal length of 40 cm and a diameter

Choose the one alternative that best completes the statement or answers the question.
-What is the power of the lens that has a focal length of 40 cm and a diameter if 5.0 cm?
A) +2.7 diopters
B) -2.5 diopters
C) +0.20 diopters
D) +2.5 diopters
E) +20 diopters

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