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Found 2 translations.
| Name | Current message text |
|---|---|
| h English (en) | </noinclude> <!-- 2. Research the structure and function of Fresnel lenses. Explain what makes these lenses so effective. --> {| align="center" | [[File:Fresnel lens.svg|thumb|220px|1: Cross section of a Fresnel lens<br>2: Cross section of a conventional plano-convex lens of equivalent power]] | [[File:Cape_Willoughby_Lighthouse_Fresnel_lens.jpg|thumb|375px|right|Close-up of a lighthouse lens]] |} A Fresnel lens (pronounced ''fray-NELL'') is a type of lens invented by Augustin-Jean Fresnel. Originally developed for lighthouses, the design enables the construction of lenses of large aperture and short focal length without the weight and volume of material which would be required in conventional lens design. Compared to earlier lenses, the Fresnel lens is much thinner, thus passing more light and allowing lighthouses to be visible over much longer distances. |
| h Spanish (es) | </noinclude> <!-- 2. Investigar la estructura y la función de los lentes de Fresnel. Explicar qué hace estos lentes tan eficaces. --> |
