(In double refraction) the light ray that does not obey the ordinary laws of refraction. Compare with ordinary ray.
- The crystals are also idealized by assuming that no incident photon is absorbed, but each emerges in either the ordinary or the extraordinary ray.
- He cited as an example Huygens's hypothesis that the extraordinary ray in doubly-refracting Iceland spar is propagated elliptically.
- Thus, a straightforward new technique is demonstrated for determining the extraordinary-ray absorption coefficient.
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Syllabification: ex·traor·di·nar·y ray
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