1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Focal Length of a Plano Convex Lens

  1. Jun 14, 2014 #1


    User Avatar


    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?

  2. jcsd
  3. Jun 14, 2014 #2


    User Avatar

    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


    User Avatar

    Thank you very much, It is clear now that the focal length is the same.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Focal Length of a Plano Convex Lens