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Geometrical optics LENSES Refraction

  1. Jul 3, 2008 #1
    1. The problem statement, all variables and given/known data


    A lens is made of glass for which the refractive index is n[r]=1.5 for red beams and n[v]=1.52 for violet beams. radii of both surfaces are the same and equal R=1m. Find the distance between foci for red and violet beams
    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Jul 3, 2008 #2

    Kurdt

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    What have you tried?
     
  4. Jul 3, 2008 #3
    I tried to sketch the situation. there i can get all possible relations between angles on both of the beams. The incident angle will be the same for both two beams. But now, how can i introduce the radius in my relations. Is there any formula conecting a lense's radius with the angle of incidence?
     
  5. Jul 3, 2008 #4

    Kurdt

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  6. Jul 4, 2008 #5
    thank you Kurdt.
     
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