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

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Power of lens, `P=1//f`
`P=1.5D`
`f=1//5=10//15=0.66 m`
A convex lens has a positive focal length. Hence, it is a convex lens or a converging lens.

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