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Homework Help: Lenses homework problem

  1. May 19, 2004 #1
    An object pin is placed 20cm in front of a convex lens which is 10 cm away from a plane mirror . An inverted image is found at the same position of the object(above the object).
    What is the focal length?
  2. jcsd
  3. May 19, 2004 #2

    Doc Al

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    Staff: Mentor

    Here are a few hints. Is the image formed by the lens real or virtual? What does a plane mirror do?

    Figure out where the image would be if the mirror wasn't there.
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