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Homework Help: Convex Mirror / Virtual Image

  1. Mar 18, 2010 #1
    1. The problem statement, all variables and given/known data
    The virtual image produced by a convex mirror is one-quarter the size of the object.
    b) What is the focal length of this mirror?

    2. Relevant equations

    1/di = 1/f - 1/do

    3. The attempt at a solution
    i found di to be -9.3 cm but when i solved for f i keep getting it wrong. Help!! (and -9.3 is correct so thats not the problem)
  2. jcsd
  3. Mar 18, 2010 #2


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    Homework Helper

    Can you show your calculations?
  4. Mar 18, 2010 #3
    i did 1/-9.3 = 1/f - 1/37 (do) then solved for f
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