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Object at focal point of converging lense

  1. Apr 17, 2005 #1
    I have a simple question that I can't seem to answer.......

    why is it that when an object is at the focal point of a converging lense, the image is at infinity? How can you show this through ray diagrams?
     
  2. jcsd
  3. Apr 17, 2005 #2

    Andrew Mason

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    The lens equation:

    [tex]\frac{1}{f} = \frac{1}{i} + \frac{1}{o} [/tex]

    What is the object distance if i = f? Or, what is the image distance if o = infinity?

    AM
     
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