Image Formation with a Thin Lens
Ray tracing is used to locate the image formed by a lens. Rays originating from the same point on the object are traced—the three chosen rays each follow one of the rules for ray tracing, so that their paths are easy to determine. The image is located at the point where the rays cross. In this case, a real image—one that can be projected on a screen—is formed.
Source
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"OpenStax College, College Physics. December 30, 2012."
http://cnx.org/content/m42470/latest/?collection=col11406/1.7
OpenStax CNX
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