Image:Hecht 6.23.jpg

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This work is copyrighted and unlicensed. It does not fall into one of the blanket fair use categories listed at Wikipedia:Fair use#Images or Wikipedia:Fair use#Audio_clips. However, it is believed that the use of this work in the article "Talk:Astigmatism":

To illustrate the object in question
Where no free equivalent is available or could be created that would adequately give the same information
On the English-language Wikipedia ([1]), hosted on servers in the United States by the non-profit Wikimedia Foundation ([2]),

qualifies as fair use under United States copyright law. Any other uses of this image, on Wikipedia or elsewhere, may be copyright infringement. See Wikipedia:Fair use and Wikipedia:Copyrights.

To the uploader: this tag is not a sufficient claim of fair use. You must also include the source of the work, all available copyright information, and a detailed fair use rationale.

This is figure 6.23 from Hecht, Eugene (1987). Optics, 2nd ed., Addison Wesley. ISBN 0-201-11609-X.

I am uploading this figure for temporary use in a discussion of how Hecht defines a concept that appears in this figure. I believe that this constitutes a fair use of this figure. In any event, the need for this is temporary and the image can be deleted after 04/14/2006.

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(del) (cur) 02:50, 8 April 2006 . . Srleffler (Talk | contribs) . . 1136×544 (52,961 bytes) ({{Fair use in|Talk:Astigmatism}} This is figure 6.23 from {{cite book | first=Eugene|last=Hecht|year=1987|title=Optics|edition=2nd ed.|publisher=Addison Wesley|id=ISBN 0-201-11609-X}} I am uploading this figure for temporary use in a discussion of how He)