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If two lenses have the same radii of curvature but different indexes

  1. Aug 24, 2014 #1
    1. The problem statement, all variables and given/known data

    If two lenses have the same radii of curvature but different indexes of refraction their focal lengths won't be equal because the one with the greater index of refraction will undergo greater refraction and will have a smaller f. Doesn't this contradict the definition of focal length which states that it has to be half of the radii of curvature?
     
  2. jcsd
  3. Aug 24, 2014 #2
    No. This applies in case of a mirror not a lens .
     
  4. Aug 24, 2014 #3

    BvU

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    My (admittedly rather dusty) memory does't have that kind of 'definition' for focal lenth at all. Who says such a thing ?
     
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