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Fitxategi:Fresnel lighthouse lens diagram.png

Fresnel_lighthouse_lens_diagram.png ‎((492 × 578 pixel, fitxategiaren tamaina: 88 KB, MIME mota: image/png))

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English: Section diagram showing how a Fresnel lens (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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Jatorria Downloaded from Adolphe Ganot (1872) Natural Philosophy for General Readers and Young Persons, D. Appleton & Co., New York, p.328, fig.257 (translated with permission from Ganot's Cours Élémentaire de Physique by Edmund Atkinson)
Egilea Adolphe Ganot
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(Fitxategi hau berrerabiltzen)		 Public domain - Ganot died in 1887; published in USA before 1923

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oraingoa12:03, 17 abendua 200712:03, 17 abendua 2007 bertsioaren iruditxoa492 × 578 (88 KB)Chetvorno{{Information |Description=Diagram of how a Fresnel lens in a lighthouse works. |Source=Downloaded from [http://books.google.com/books?id=sKELAAAAYAAJ&pg=PA328 Adolphe Ganot (1872) ''Natural Philosophy for General Readers and Young Persons'', D. Appleton

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