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Converging meniscus lens

  1. Jul 20, 2011 #1
    A converging meniscus lens has an index of refraction of 1.55 and radii of curvature for its surfaces of 6.00 cm and 11.0 cm. The concave surface is placed upward and filled with carbon tetrachloride which has n = 1.46. What is the focal length of the glass combination?

    So I tried using the lens makers equation and got
    1/f=((1.55/.146)-1)(1/6-1/11)
    took the inverse and got 214 cm, which is wrong, so im wondering were I went wrong at.
     
  2. jcsd
  3. Jul 21, 2011 #2
    What?
     
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