"Capt. Neal®" wrote in message


lens \"lenz\ n [L lent-, lens lentil; so called fr. the shape of a convex
lens] 1 : a curved piece of glass or plastic used singly or combined in an
optical instrument for forming an image; also : a device for focusing
radiation other than light 2 : a transparent body in the eye that focuses
light rays on receptors at the back of the eye

© 1995 Zane Publishing, Inc. The Merriam-Webster Dictionary © 1994 by
Merriam-Webster, Incorporated

A simplistic layman's definition at best, and far from inclusive or
esoteric. Plano lenses, for example, used in spectacles are curved both
front and back, and allow light to pass through them without being
refracted. Should I continue?

Max