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Converging/diverging mirrors/lenses: conceptual question

  1. Nov 20, 2016 #1

    tensor0910

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    Gold Member

    1. The problem statement, all variables and given/known data

    Im having trouble knowing/remembering when my di and do should be positive or negative. Does anyone have any tips/advice for this?



    2. Relevant equations

    1/f = 1/di + 1/do, hi/ho = di/do



    3. The attempt at a solution
    No solution. Just a question.
     
  2. jcsd
  3. Nov 21, 2016 #2

    andrevdh

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    Homework Helper

    Real images and objects positive, virtual images and objects negative.
    Converging lens focal length positive, diverging negative.
     
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