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A doctor has prescribed a corrective lens of power -1.5 D. Find the focal length of the lens. Is the lens diverging or converging?
Asked by Topperlearning User | 21 Jul, 2017, 03:08: PM
answered-by-expert Expert Answer

Power, P = -1.5 D

begin mathsize 12px style therefore space Focal space lenght comma space straight f space equals space 1 over straight P straight f space equals space fraction numerator 1 over denominator negative 1.5 space straight D space end fraction space equals space minus 0.67 space straight m end style
Since, the focal length is negative; hence the lens is diverging, i.e., concave lens.
Answered by | 21 Jul, 2017, 05:08: PM

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