File:MuseeMarine-phareFresnel-p1000466.jpg · Wikimedia Commons · See Wikimedia Commons
In the Vinony graph
Vinony's link graph records 1,431 inbound references to Fresnel lens, and connects out to lens, 3D printing and Total internal reflection.
Vinony files it under French inventions, Lenses and Lighthouse fixtures.
Vinony links it to 48 Wikipedia language editions.
Wikidata facts
- Named after
- Augustin-Jean Fresnel
- Image
- Fresnel lighthouse lens diagram.png
Show 3 more facts
- Commons category
- Fresnel lenses
- discoverer or inventor
- Augustin-Jean Fresnel
- on focus list of Wikimedia project
- Wikipedia:Vital articles/Level/4
Sources (2)
via Wikidata · CC0
~36 min read
Encyclopedic overview
First-order rotating catadioptric Fresnel lens, dated 1870, displayed at the Musée national de la Marine, Paris. In this case the dioptric prisms (inside the bronze rings) and catadioptric prisms (outside) are arranged to concentrate the light from the central lamp into four revolving beams, seen by sailors as four flashes per revolution. The assembly stands 2.54 metres (8.3 ft) tall and weighs about 1.5 tonnes (3,300 lb).
A Fresnel lens (/ˈfreɪnɛl, -nəl/ FRAY-nel, -nəl; /ˈfrɛnɛl, -əl/ FREN-el, -əl; or /freɪˈnɛl/ fray-NEL) 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.
Excerpted from Wikipedia’s “Fresnel lens” article, available under the CC BY-SA 4.0 licence.