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Focal Length experiment readings

  1. Feb 12, 2009 #1
    Hello, I need help with the lens experiment, the aim of which is to determine the focal length of a concave lens by combining it coaxially with a convex lens.

    Given the focal length of the CONVEX lens is 15cm.
    and the focal length of the CONCAVE lens is 30cm.

    Can you give me a set of reading, plotting which on the graph paper the slope of the st. line shall give the CONCAVE lens' focal length.

    Thanks in advance.
  2. jcsd
  3. Feb 12, 2009 #2


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    Don't you know how to calculate the focal length of a compound lens?

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