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Summary
| Description |
English: definitions of ray, pencil, and beam, in Optics, scanned by Google from Henry Coddington's 1829 A system of optics, Part 1. |
| Date | |
| Source | book: A system of optics, Part 1 |
| Author | Henry Coddington |
Licensing
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer.  You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
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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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