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Consider a virtual object to the right of a
converging thin lens (light travel is left to right, and the optical axis is
horizontal). Three rays originally headed toward a given object
point can easily be traced:
1) A horizontal ray originally headed at the
object point refracts through the right focal point.
2) A ray passing through the left focal point and
originally headed at the object point refracts into a horizontal
ray.
3} A ray passing through the lens center and
originally headed at the object point passes undeviated through the
lens.
Things are only a little more complicated for a
diverging lens.
Bob Sciamanda (W3NLV)
Physics, Edinboro Univ of PA (em) trebor@velocity.net http://www.velocity.net/~trebor
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