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Focal length vs. focal points

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  1. Mar 13, 2016 #1
    1. The problem statement, all variables and given/known data
    This is a silly question... but I know that a lens has two focal points but one focal length.
    If each focal point is at 5cm from the lens, would the focal length be 5cm, or 10cm (adding the position of each focal point together)?

    2. Relevant equations
    N/A

    3. The attempt at a solution
    N/A
     
  2. jcsd
  3. Mar 13, 2016 #2
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