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Convex mirror

  1. Nov 10, 2008 #1
    1. The problem statement, all variables and given/known data

    A spherical Christmas tree ornament is
    4.76 cm in diameter.
    What is the magnification of the image of
    an object placed 11.9 cm away from the ornament?

    2. Relevant equations

    f = .5* r

    (1/di) + (1/do) = 1/f


    3. The attempt at a solution

    f = .5*2.38 = 1.19 cm

    (1/di) = (1/1.19) - (1/11.9) = 1.32222 cm

    m =-(1.32222/11.9) = -0.1111
  2. jcsd
  3. Nov 14, 2008 #2


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    Homework Helper

    Hi Kris1120,

    I don't believe this is right. What type of mirror is this? What does that tell you about the focal length?
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