Talk:Ray (optics)
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Perhaps this article could use diagrams illustrating some or all of the named rays.--Srleffler 06:14, 9 December 2005 (UTC)
[edit] Questionable edit
I'm concerned about this edit. The editor appears to be trying to clarify or correct the definitions, but the new material is not so clear to me. I'm not sure what he/she means by "starts at the object". Assuming the object is not a point, to define a ray you have to specify where on the object the ray starts. The old text did so (although it also made some assumptions and was not so clear). It is not clear to me that these new changes are correct. --Srleffler 06:28, 29 November 2007 (UTC)
Expanding on the above, the new definitions given for marginal and chief rays are not in agreement with those in Greivenkamp's book (reference in article), and are uncited. I will revert for now to the definitions that have citation support. I particularly note that the claim that images are formed where the marginal ray crosses the chief ray (as opposed to the optic axis) appears to be wrong. Perhaps we just have conflicting definitions of the same terms, used by different authors. If that is the case, a citation needs to be provided in support of the other definition, and the article needs to be broadened to explain and compare both usages.--Srleffler 20:44, 2 December 2007 (UTC)
