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Finding focus

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  1. Apr 12, 2015 #1
    1. The problem statement, all variables and given/known data
    What focus is needed for in order for a diverging lens to produce a magnification of 0.60x on an object located 1.40 meters away?

    2. Relevant equations
    M=hi/ho
    1/do + 1/di = 1/f
    M= -di/do

    3. The attempt at a solution
    -di / 1.4 = 0.6
    1/1.4 + 1/.84 =1/f
    -di=0.84
    1.42
     
  2. jcsd
  3. Apr 13, 2015 #2

    ehild

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    Is that + sign correct?
     
  4. Apr 13, 2015 #3

    andrevdh

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    Just a small remark - rather say what focal length is needed....
     
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