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Homework Help: Multi-Lens System Ray Tracing -Please help

  1. Sep 20, 2008 #1
    Multi-Lens System Ray Tracing --Please help

    lenses in combination.jpg
    1. The problem statement, all variables and given/known data
    It isn't possible to form an image of a real object on a screen with only diverging lens. However, if we use a converging lens, it is possible to create what is called a virtual object. The diverging lens has a virtual object if the image formed by the converging lens occurs on the far side of the diverging lens. The diverging lens can then create a real image of the virtual object.

    In the figure attached I have drawn in some rays. I drew the red rays, pretending that the diverging lens wasn't present. The meeting of the red rays is where the virtual object is located.

    Then, treating this virtual object as the image, I drew green rays to show the image that would be formed by the diverging lens from this virtual object. Then I extended those lines (using blue lines) to show where the real image would be. I have drawn this with a ruler on paper several times, and every time I come up with the real image being in front of the virtual object, and I'm pretty sure that the real image is supposed to be further down the optical axis since diverging lenses spread out light. What am I doing wrong in my ray tracing?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
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