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Homework Help: Optics help

  1. Apr 13, 2004 #1
    i need some help with this problem anyone want to give it a shot? thanks

    A camera is supplied with two interchangeable lenses, whose focal lengths are 35.0 and 150.0 mm. A woman whose height is 1.80 m stands 10.00 m in front of the camera. What is the height (including sign) of her image on the film, as produced by
    (a) the 35.0-mm lens and
    (b) the 150.0-mm lens?
  2. jcsd
  3. Apr 14, 2004 #2

    Doc Al

    User Avatar

    Staff: Mentor

    thin lens equation

    Why don't you give it a shot? You'll need the lens equation:
    [tex]\frac{1}{f} = \frac{1}{o} + \frac{1}{i}[/tex]

    And you'll also need the magnification:
    [tex]M = -\frac{i}{o}[/tex]

    To understand what these mean, and how to use the sign conventions, read your text!
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