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Convex mirror. PLEASE HELP

  1. Apr 23, 2007 #1
    Convex mirror. PLEASE HELP!!

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

    An object 30 cm tall is placed 20 cm in front of a convex mirror. If the height of the image is +10 cm, find the focal lenght of the mirror.

    2. Relevant equations



    3. The attempt at a solution

    I know to use 1/f = -(Image distance from V) / Object distance from V. But, now they tell me how tall they are. How to solve now?
     
  2. jcsd
  3. Apr 23, 2007 #2

    andrevdh

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