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Homework Help: Optics question, locate mirror and its focal length

  1. Jan 21, 2013 #1
    1. The problem statement, all variables and given/known data

    "An object 10 cm tall is placed at the zero mark of a meter stick. A spherical mirror located at some point on the meter stick creates an image of the object that is upright, 4 cm tall, and located at the 42 cm mark of the meter stick. Where is the mirror located and what is the focal length?"

    2. Relevant equations

    1/do + 1/di = 1/f

    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Jan 22, 2013 #2
    What have you done so far?
     
  4. Jan 22, 2013 #3
    Well I've determined it must be a convex mirror, for the upright and miniature image. I have drawn a few rays from the real 10 cm object to the 4 cm image, but I am not sure how to find the location of the mirror and its focal point from that.
     
  5. Jan 22, 2013 #4
    What rays in particular have you tried? Just two rays is enough.
     
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