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crossed nicols

plural noun, often capitalized N
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Definition of crossed nicols

: two nicol prisms placed one in front of the other and so oriented that their transmission planes for plane-polarized light are at right angles with the result that light transmitted by one is stopped by the other unless modified by some intervening body

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“Crossed nicols.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/crossed%20nicols. Accessed 13 Jul. 2020.

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