focus, in optics, the point at which rays converge after reflection by a concave mirror or refraction by a convex lens, also known as a real focus. The point from which rays appear to diverge after reflection by a convex mirror or refraction by a concave lens is known as a virtual focus.
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julee
New Mexico Alcohol Addiction Treatment
julee | Homepage | 08.28.08 - 2:36 am | #

Wow. I'm actually speechless. Rock on julee.
Gene | 08.28.08 - 11:30 am | #