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ordinary ray

noun
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Definition of ordinary ray

: the part of a ray divided in two by double refraction that follows the ordinary laws of refraction because its speed is the same in all directions through the doubly refracting medium

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“Ordinary ray.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ordinary%20ray. Accessed 25 Jan. 2021.

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