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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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Here, `P = + 1.5 D, f = ?`
From `f = 100/P, f = 100/(1.5) = 66.7 cm`
The prescribed lens is converging or convex as its power is positive.

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