File:Fresnel lighthouse lens diagram.png

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	10:03, 17 December 2007		492 × 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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