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Homework Help: Refraction, how tall is the image?

  1. Feb 22, 2009 #1
    1. The problem statement, all variables and given/known data

    If the object distance in the following picture were 8.0 m and the image distance were 2.0 m, and the object is 0.50 m tall, how tall is the image.

    Ho = 0.5
    So = 2.0
    Si = 8.0
    2. Relevant equations
    Ho / Hi = So / -Si
    In order these variables are hight object, hight image, object distance and object image.

    3. The attempt at a solution

    0.5/ Hi = 2.0/8.0

    This is where the problem occurs. How do I get Hi on one side of the equation?

    I don't know how to move the numerator to the other side of the equation... Please help... I think there is a very simple solution but, it is eluding me.
  2. jcsd
  3. Feb 22, 2009 #2


    User Avatar
    Homework Helper

    Where did the minus sign go?
    Cross multiply to eliminate all fractions:
    0.5*8.0 = 2.0*Hi
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