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Homework Help: Help! mirror question!

  1. Dec 13, 2007 #1
    20. Using the mirror equation and the magnification equation, find the four properties of the image formed in a concave mirror with a focal length of 50 cm, if the object is 1.5 m from the mirror and is 2.5 cm high.

    Can anyone tell me the mirror equation and magnification equation and how to apply to this problem please?... Thankyou
  2. jcsd
  3. Dec 13, 2007 #2


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    Mirror equation is
    1/image distance + 1/object distance = 1/focal length

    magnification equation is
    m = image size / object size

    Draw a diagram or you will never get the sign convention right - hint experiment with a spoon to work out which way up the image should be.
  4. Dec 13, 2007 #3
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