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Specifically, I doubt that from everyday life experiences one would
generate the notion that three special rays are what create a point on an
image. Yet, this notion is so clearly present that many _teachers_
expressly use it to make predictions about what will happen if one covers
half a lens. I have even had groups of teachers suggest that if one were
to cover portions of the lens at the top, middle, and bottom edges of a
lens that the image of the top of the object would not be visible. (Think
about it. Where to the three principal rays intersect the lens?)
Dewey
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Dewey I. Dykstra, Jr.