ଫାଇଲ:Fresnel lighthouse lens diagram.png
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Fresnel_lighthouse_lens_diagram.png (୪୯୨ × ୫୭୮ ପିକସେଲ, ଫାଇଲ ଆକାର: ୮୮ KB, ଏମ.ଆଇ.ଏମ.ଇର ପ୍ରକାର: image/png)
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| ବିବରଣୀ |
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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| ମୂଳାଧାର | 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) | ||||||||||||||||
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| ଅନୁମତି (ଏହି ଫାଇଲକୁ ପୁଣି ବ୍ୟବହାର କରିବେ) |
Public domain - Ganot died in 1887; published in USA before 1923 | ||||||||||||||||
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This is a faithful photographic reproduction of a two-dimensional, public domain work of art. The work of art itself is in the public domain for the following reason:
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This photographic reproduction is therefore also considered to be in the public domain in the United States. In other jurisdictions, re-use of this content may be restricted; see Reuse of PD-Art photographs for details. | ||||
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ଏହା ଫାଇଲଟି ସେତେବେଳେ ଯେମିତି ଦିଶୁଥିଲା ତାହା ଦେଖିବା ପାଇଁ ତାରିଖ/ବେଳା ଉପରେ କ୍ଲିକ କରନ୍ତୁ
| ତାରିଖ/ବେଳ | ନଖ ଦେଖଣା | ଆକାର | ବ୍ୟବହାରକାରୀ | ମତାମତ | |
|---|---|---|---|---|---|
| ଏବେକାର | ୧୧:୦୩, ୧୭ ଡିସେମ୍ବର ୨୦୦୭ | | ୪୯୨ × ୫୭୮ (୮୮ KB) | wikimediacommons>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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