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A Fresnel lens (/ ˈ f r eɪ n ɛ l,-n əl / FRAY-nel, -nəl; / ˈ f r ɛ n ɛ l,-əl / FREN-el, -əl; or / f r eɪ ˈ n ɛ l / fray-NEL [1]) is a type of composite compact lens which reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections.
A VRB-25 at Highland Light Side view of a six-lens VRB-25. For outdoor use, bird spikes are added to the top For outdoor use, bird spikes are added to the top The VRB-25 is a lighthouse optical system designed and built by Vega Industries Ltd. in Porirua , New Zealand .
Hyper-radial or hyperradiant Fresnel lenses are Fresnel lenses used in lighthouses. They are larger than "first-order" lenses , having a focal length (radius) of 1330 mm (52.36 inches). The idea was mentioned by Thomas Stevenson in 1869 [ 1 ] and first proposed by John Richardson Wigham in 1872, and again proposed by Thomas Stevenson in 1885 ...
Close-up view of a flat Fresnel lens. This thin, lightweight, non-fragile and low-cost lens can be used as burning-glass in emergency situations. A makeshift burning glass, using the eyepiece of a telescope, being used to burn a leaf. Burning glasses (often called fire lenses) are still used to light fires in outdoor and primitive settings. [14]
A Fresnel lantern (pronounced frəˈnɛl or fruh-nel) is a common lantern used in theatre that employs a Fresnel lens to wash light over an area of the stage. The lens produces a wider, soft-edged beam than a spotlight or key light , and is commonly used for back light and top light.
Barbier, Benard, et Turenne (BBT) was a French company founded in 1862, specializing in the manufacture of spotlights, Fresnel lenses for lighthouses, and lighting systems. [1] It was the world's leading producer of lighthouse beacons from the end of the 19th century onwards. It dissolved in 1982. [2]
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