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Distance between lense and film to get a focused picture

  1. Apr 22, 2009 #1
    1. The problem statement, all variables and given/known data
    Esperanza uses a 35-mm camera with a standard lens of focal length 50.0 mm to take a photo of her son Carlos, who is 1.3 m tall and standing 4.0 m away.

    What must be the distance between the lens and the film to get a properly focused picture?
    this answer is 50.6 mm.

    What is the magnification of the image?
    shouldnt this just be m=-q/p. i keep getting -.013 and its wrong
    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Apr 24, 2009 #2


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    Staff Emeritus
    Science Advisor
    Gold Member

    Re: magnification

    There doesn't seem to be anything wrong with the calculation, could it just be you need to use more significant figures?
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