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Convex mirror problem help?

  1. Apr 22, 2009 #1
    Convex mirror problem help??

    1. The problem statement, all variables and given/known data
    a convex mirror has a focal length of 75cm. an object with a height of 2.0m is 6.0m from the mirror.
    a) what is the distance from the object's virtual image to the mirror?
    b) what is the height of the object's image?

    2. Relevant equations

    1/f = 1/do + 1/di

    3. The attempt at a solution
    1/0.75m = 1/6.0m + 1/di
    di = 0.857m

    but the answer should be -0.67 for a and i dont know part b
  2. jcsd
  3. Apr 22, 2009 #2


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    Homework Helper

    Re: Convex mirror problem help??

    Use proper sign convension. Focal length of the convex mirror to be taken as negative.
    For second part, use magnification formula. m = di/do
  4. Apr 22, 2009 #3
    Re: Convex mirror problem help??

    thanks! ^^
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