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Biconcave and double concave

  1. Feb 19, 2012 #1
    Are they the same thing? I know biconcave has R1=negative and R2= positive.

    edit: Thanks for any help.
     
  2. jcsd
  3. Feb 20, 2012 #2

    Redbelly98

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    Hi,

    Yes they mean the same thing, a lens that looks like this:

    )(
     
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