File:Ray pencil beam Coddington 1829.png

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	03:40, 17 December 2010		658 × 446 (40 KB)	Dicklyon	{{Information \|Description={{en\|1=definitions of ray, pencil, and beam, in Optics, scanned by Google from Henry Coddington's 1829 A system of optics, Part 1.}} \|Source=book: A system of optics, Part 1 \|Author=Henry Coddington \|Date=1829 \|Permission= \|othe

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