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optic axis |
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optic axis [′äp·tik ′ak·səs] (optics) The axis in a doubly refracting medium in which the ordinary and extraordinary waves propagate with the same velocity, and double refraction vanishes. Also known as optical axis; principal axis. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Spherical Aberrations result from the fact that focal points of light rays far from the optic axis of a spherical lens are different from the focal points of rays of the same wavelength passing near the center. |
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