Reading glasses of what power are needed for a person whose near point is 135 cm,...

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Reading glasses of what power are needed for a person whose near point is 135 cm,...

Reading glasses of what power are needed for a person whose near point is 135 cm, so that he can read a computer screen at 56 cm? Assume a lens-eye distance of 1.7 cm. Express your answer using two significant figures.

P= ____ D

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