16. Find the focal length of a lens of power - 2.0 D Wap 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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16.f=1/-2.0 = -0.5m
17. f=1/1.5 = 0.66m ( it is converging lens)
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