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Concave Mirror

  1. Feb 23, 2009 #1
    1. The problem statement, all variables and given/known data

    The figure shows a meter stick held lengthwise along the optical axis of a concave mirror. (Intro 1 figure) - figure attached

    How long is the image of the meter stick?

    2. Relevant equations

    1/f = 1/do + 1/di

    3. The attempt at a solution[/b

    1/di = 1/f - 1/do = 1/40 -1/60
    di = 120 cm

    but im not sure how to proceed after this part

    any help would be appreciated
     

    Attached Files:

  2. jcsd
  3. Feb 23, 2009 #2

    Doc Al

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    Staff: Mentor

    You found the location of the image of one end of the stick; now find the other.
     
  4. Feb 23, 2009 #3
    so for the second point
    1/di = 1/f - 1/do = 1/40 - 1/160
    di = 53.3

    so the length of the scale would be (120+53.3) = 173.3 cm

    or (120-53.3) = 66.7 cm ?
     
  5. Feb 24, 2009 #4

    Doc Al

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    Staff: Mentor

    The length of the image will be the difference in the position of each end.
     
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