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optical density

optical density see refraction .

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"optical density." The Columbia Encyclopedia, Sixth Edition. 2008. Encyclopedia.com. 25 Nov. 2009 <http://www.encyclopedia.com>.

"optical density." The Columbia Encyclopedia, Sixth Edition. 2008. Encyclopedia.com. (November 25, 2009). http://www.encyclopedia.com/doc/1E1-X-opticden.html

"optical density." The Columbia Encyclopedia, Sixth Edition. 2008. Retrieved November 25, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-X-opticden.html

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