Numerical

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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#### Solution

Power of lens, P= 1/f

P= 1.5D

f= 1/1.5 = 10/15 = 0.66 m

A convex lens has a positive focal length. Hence, it is a convex lens or a converging lens.

Concept: Power of a Lens

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