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Homework Help: Bi convex lens

  1. Sep 13, 2016 #1
    1. The problem statement, all variables and given/known data
    If the focal length of the bi convex lens is 25 cm then the power of the lens will be?
    Since the light striking the lens converges at a point behind the lens will the answer come in positive?

    2. Relevant equations
    Power of lens D= 1/f

    3. The attempt at a solution
    D= 1/25= +0.04 dioptre
  2. jcsd
  3. Sep 13, 2016 #2

    rude man

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    You are using the wrong units in your formula.
  4. Sep 13, 2016 #3
    Focal length should be in mm?
  5. Sep 13, 2016 #4
    Or is it meters? Is the answer +4 diopter?
  6. Sep 13, 2016 #5


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  7. Sep 13, 2016 #6
    I see.Thank you for the help rude man and BvU.
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