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Focal Length of a Plano Convex Lens

  1. Jun 14, 2014 #1

    bgq

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    Hi,

    The focal length of the Plano-Convex lens as calculated by the lens maker equation: Does it work when light crosses the lens from the convex side, planar side, or both?

    Thanks.
     
  2. jcsd
  3. Jun 14, 2014 #2

    jtbell

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    Staff: Mentor

    Calculate it both ways: using R1 for the convex side and R2 for the plane side; and using R1 for the plane side and R2 for the convex side. Does it make a difference in the result?

    Hint: watch out for the + and - signs!
     
  4. Jun 15, 2014 #3

    bgq

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    Thank you very much, It is clear now that the focal length is the same.
     
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