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Homework Help: How to solve for distance of object with a concave mirror?

  1. Apr 24, 2016 #1
    1. The problem statement, all variables and given/known data
    An object is placed a distance do in front of a concave mirror with a radius of curvature r = 6 cm. The image formed has a magnification of M = 4.3. Solve for the object's distance.
    2. Relevant equations
    M = -di/do
    (1/do) + (1/di) = 2/R = 1/f
    3. The attempt at a solution
    I've tried to rearrange the magnification equation and sub it into the spherical mirror equation in order to cancel out the di's, so I can solve for do using radius and magnification, except I'm still not even entirely sure how you would manage to make this work.
    How would I rearrange these equations to solve for do?
  2. jcsd
  3. Apr 24, 2016 #2
    Have you tried solving for 1/di? I mean, find that in the first equation and plug it in the second. From there it should be easy.
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