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Placement of an object and magnification

  1. Sep 18, 2013 #1
    1. The problem statement, all variables and given/known data

    An object is 1 m from a screen. At what points may a 0.05-m focal length lens be placed so as to produce a sharp image on the screen? What are the corresponding magnifications?

    2. Relevant equations

    Lens maker equation:

    1/s + 1/s' = 1/f

    Magnification equation:

    m = -s'/s = -f/s

    3. The attempt at a solution

    For the first question:

    1/s' = 1/f -1/s = 1/0.05 m-1 = -.95 m.

    1 m - .95 m = 0.05 m away from the screen.


    m = -0.05 m / 1 m = -0.05

    Is this right?
  2. jcsd
  3. Sep 19, 2013 #2
    Use the fact that the sum of the object and image distances is 100 cm.
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