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?


The power of this lens is positive (with a plus sign), therefore, this is a convex lens or converging lens. Now,

Power, P =


So, +1.5 =


Or m


cm


So, Focal length of lens, f = +66.7 cm.


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