File:Ray pencil beam Coddington 1829.png

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Ray_pencil_beam_Coddington_1829.png ‎(658 × 446 pixels, file size: 40 KB, MIME type: image/png)

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current03:40, 17 December 2010Thumbnail for version as of 03:40, 17 December 2010658 × 446 (40 KB)commons>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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