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Fresnel lens   Listen
Fresnel lens

noun
1.
Lens composed of a number of small lenses arranged to make a lightweight lens of large diameter and short focal length.





WordNet 3.0 © 2010 Princeton University


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"Fresnel lens" Quotes from Famous Books



... interior of the lantern, brings to a uniform pressure the inclosed gas, whose pressure continues diminishing as a consequence of the consumption. The lantern is protected against wind and waves by very thick convex glasses set into metallic cross-bars, c. The flame is located in the focus of a Fresnel lens, b, consisting of superposed prismatic rings, and adjusted at its lower part with a circle, d, while a conical ring, e makes a joint at its other extremity. This ring is held by the top piece of the lantern through ...
— Scientific American Supplement, No. 324, March 18, 1882 • Various


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