A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?

Power of a lens, P = 1/f (in meters)
Power, P = 1.5d
F = 1/1.5 = 10/15 = 0.66m
A convex lens has a positive focal length. Hence, it is a convex lens or a converging lens.

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