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Homework Help: What is the distance of the image to this lense

  1. Feb 23, 2008 #1
    1. The problem statement, all variables and given/known data

    A lens placed at the origin with its axis pointing along the x axis produces a real inverted image at x = -24 cm that is twice as tall as the object

    What is the image distance?

    2. Relevant equations

    m = -d'/d

    3. The attempt at a solution

    I thought d=24 cm. and h' = -2h
    then use m = h'/h to solve for the m. which I got m = -2.
    then I used m = -d'/d
    -2 = -d'/24
    d' = 48 cm.

    I don't know where I did wrong..
    please help me..
  2. jcsd
  3. Feb 23, 2008 #2
    Never mind..
    I got it.. :)
  4. Feb 24, 2008 #3
    what did you get wrong>>
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