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Effective focal length of two plano convex

  1. Oct 3, 2009 #1
    1. The problem statement, all variables and given/known data

    Hello
    Two plano convex with f1=f2=30mm and R1=15.45mm and R2=-R1. The two plano convex have the same thickness too (3.16 mm) and their curves colide in the propagation axis.
    I believe you understand what i mean
    What is the focal length of the two plano convex system?

    Thanks in advance


    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Oct 4, 2009 #2

    tiny-tim

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    Hi delgado! Welcome to PF! :smile:

    (try using the X2 tag just above the Reply box :wink:)

    Show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:
     
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