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

The focal length of the lens is -1 / 1.5 = -2/3 meters. The prescribed lens is converging because the power of the lens is positive (+1.5D). Converging lenses have positive power, while diverging lenses have negative power. Converging lenses are thick in the middle and thin at the edges, and they refract light inwards.