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A doctor prescribes a corrective lens of power +1.5 D. What is its focal length, and is it diverging or converging?

Question
A doctor prescribes a corrective lens of power +1.5 D. What is its focal length, and is it diverging or converging?
f » +0.67 m, converging
f » -0.67 m, diverging
f = +1.5 m, diverging
f = -1.5 m, converging
Answer
f » +0.67 m, converging
Detailed Explanation
f = 1/P = 1/1.5 » +0.67 m; since the focal length is positive, this is a converging (convex) lens.
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