Optic axis of a crystal

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Science and technology

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What Wikipedia says

An optic axis of a crystal is a direction in which a ray of transmitted light suffers no birefringence (double refraction). An optic axis is a direction rather than a single line: all rays that are parallel to that direction exhibit the same lack of birefringence.

Excerpt from the Wikipedia article “Optic axis of a crystal”, under the CC BY-SA 4.0 license. Read the article on Wikipedia