extraordinary ray
noun
: the part of a ray divided in two by double refraction that does not follow the ordinary laws of refraction because its speed varies with its direction in the doubly refracting medium
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“Extraordinary ray.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/extraordinary%20ray. Accessed 25 Nov. 2024.
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