File:Fresnel lighthouse lens diagram.png
Summary
Section diagram showing how a <a href="https://en.wikipedia.org/wiki/Fresnel_lens" class="extiw" title="wikipedia:Fresnel lens">Fresnel lens</a> (A) in a lighthouse works to collimate light from an oil lamp (L) into a parallel beam. The Fresnel lens, invented in 1822 by Augustin-Jean Fresnel, increased the light projecting power of lighthouses greatly without the weight of a conventional lens of its size. Also shown are mirror strips (m,n) mounted above and below the lens that most lighthouses had, to gather more of the lamp's light. Alterations: removed caption, erased blots in white areas, changed brightness levels to get rid of noise in white areas, sharpened light path lines.
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 06:57, 5 January 2017 | | 492 × 578 (88 KB) | 127.0.0.1 (talk) | Section diagram showing how a <a href="https://en.wikipedia.org/wiki/Fresnel_lens" class="extiw" title="wikipedia:Fresnel lens">Fresnel lens</a> <i>(A)</i> in a lighthouse works to collimate light from an oil lamp <i>(L)</i> into a parallel beam. The Fresnel lens, invented in 1822 by Augustin-Jean Fresnel, increased the light projecting power of lighthouses greatly without the weight of a conventional lens of its size. Also shown are mirror strips <i>(m,n)</i> mounted above and below the lens that most lighthouses had, to gather more of the lamp's light. Alterations: removed caption, erased blots in white areas, changed brightness levels to get rid of noise in white areas, sharpened light path lines. |
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