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It is desired to magnify reading material by a factor of 3.0

It is desired to magnify reading material by a factor of 3.0

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Answer #1

do=-8.5 cm
magnification=di/do=3
                      di=3do
                             =3*(-8.5)
                         =-25.5 cm
use lend formula
1/f = 1/di - 1/d0
      =1/-25.5     - 1/-8.5
      f=12.75 cm
Power= 100/f
            =100/12.75
            = + 7.84 dipoters

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