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Convex mirror. 2 objects

  1. Apr 9, 2009 #1
    1. The problem statement, all variables and given/known data
    An object is located 14 cm in front of a convex mirror, the image being 7 cm behind the mirror. A second object, twice as tall as the first one, is placed in front of the mirror, but at a different location. The image of this second object has the same height as the other image. How far in front of the mirror is the second object located?


    I know I need to use the mirror equation... but I am totally LOST!!
     
  2. jcsd
  3. Apr 9, 2009 #2

    rl.bhat

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    Homework Helper

    First of all find the focal length of the convex mirror and magnification. In this problem magnification v/u = 1/2 = I/o. When the When the size of the object doubles keepin image height the same. magnification becomes 1/4.
    So V'/U' = 1/4. Write V' in terms of U', substitute in the mirror formula to get U'
     
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