Fresnel lens.

Pronounced “fruh-NELL.” A type of flat lens, usually a thin sheet of plastic or glass with embossed or engraved concentric rings in its surface.

Such lenses tend to distribute light evenly over the surface. They’re commonly used on high-brightness viewfinder screens, overhead projectors, etc. The lens design was invented by French physicist Augustin Fresnel (1788-1827), who used them in lighthouses.

cf. viewfinder

Entry last updated 2002-04-08. Term 539 of 1487.

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