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  • 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?

Q 17.     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?

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\\f=\frac{1}{P}\\ f=\frac{1}{1.5}\\ f=0.6667\ m\\ f=66.67\ cm

The less is convex because its focal length is positive and therefore is converging.

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