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Lens' equation (optics)

  1. Feb 12, 2009 #1
    For the Lens' equation

    1/f = 1/u + 1/v

    why can both the x- and y-intercepts be considered equal to 1/f?
  2. jcsd
  3. Feb 12, 2009 #2
    When u becomes infinite what does 1/u become?What happens when v becomes infinite?
    Last edited: Feb 12, 2009
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