plural noun Optics.
two plane mirrors joined together in a way that makes them useful for studying interference patterns.
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What Are 5 Types Of Lexical Verbs?Lexical verbs are the main verbs (or action words) in a sentence. They can show the subject’s action or express a state of being. They fall into several categories: transitive, intransitive, linking, dynamic, and static. Transitive and Intransitive Verbs A transitive verb expresses action, and needs a direct object to receive that action. “Alice sees the candle,” is an example. Sees is the lexical verb …
Origin of Fresnel mirrors
First recorded in 1965–70; see origin at fresnel
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019