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Spherical Mirrors an ray diagram

  1. Apr 16, 2009 #1
    1. The problem statement, all variables and given/known data
    When an object is located very far away from a convex mirror, the image of the object is 18 cm behind the mirror. Using a ray diagram drawn to scale determine where the image is located when the object is placed 9.0 cm in front of this mirror. Note that the mirror must be drawn to scale also. In your drawing, assume that the height of the object is 3.0 cm.


    2. Relevant equations
    hi/h0=[-di/d0=di-f/f] 1/di=1/f-1/di
    di/d0=di/f-1 1/di+1/di=f

    3. The attempt at a solution
    d0=infinite
    1/infinite+1/di=1/f
    f=-18.0 cm

    d0=9.00cm
    1/9.00+1/di=1/-18
    di=-18

    -18/9=hi/3
    hi= -6.00cm

    ?!but when I draw this it doesn't equal to -6cm
     
    Last edited: Apr 16, 2009
  2. jcsd
  3. Apr 16, 2009 #2

    rl.bhat

    User Avatar
    Homework Helper

    d0=9.00cm
    1/9.00+1/di=1/-18
    di=-18

    Check this calculation.
     
  4. Apr 16, 2009 #3
    Yush! It worked! Thanks a bunch!
     
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