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Concave mirror radius

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

    A concave mirror has a focal length of
    33.5 cm.
    Determine the object position for which the
    resulting image is upright and five times the
    size of the subject.
    Answer in units of cm.

    2. Relevant equations

    m=-(di/do)

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

    3. The attempt at a solution

    1/do = (1/35) - (1/5) = -0.170149
    do= -5.87719
     
  2. jcsd
  3. Nov 10, 2008 #2

    Redbelly98

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    You're assuming di is 5 cm here, which isn't true.
     
  4. Nov 10, 2008 #3
    I don't know how to solve for one without the other?
     
  5. Nov 12, 2008 #4

    Redbelly98

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    You can write di in terms of do and m (using the magnification equation you had).

    Then, substitute that for di in the "1/f=..." equation.
     
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