If far point or near point of a person's eye is given how to calculate Power of lens required for the person?

*If far point is given take that as the image distance[v]...and object distance[u] as infinity...& if near pt is giiven take 'u' as 25cm, thn use the lens formula to find the focal length....also remember 1infinity=0.....after getting the focal length substitute tht value in the formula 1f to get the power of the lens...*

*~thnx~*

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