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Lensmaker formula

  1. Apr 11, 2007 #1
    1. The problem statement, all variables and given/known data
    a focal length of 7.3cm for a double concave lens, find the index of refraction using lensmaker law and the radius which can be found using the following equations.


    2. Relevant equations
    focal length is 7.3 find radius focal length x 2=radius. Lens maker formula
    1/f=(n-1)(1/R1-1/R2)


    3. The attempt at a solution

    I got 2 for the index of refraction
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Apr 11, 2007 #2

    daniel_i_l

    User Avatar
    Gold Member

    Looks good to me.
     
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