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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.
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| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Optic axis of a crystal | is a | direction in which a ray of transmitted light suffers no birefringence | 0.90 | text |
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