Compute the all parts of given problem:
Problem: The image of a tree on a 35mm color slide is 1.9mm high. It is to be projected onto a screen 6 m from the slid, and is to appear 324 mm high.
Part I: what focal length lens (in meters) is needed?
Part II: what is the distance in meters between the lens and the slide?
Part III: what is the magnification of the system?
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