1) Beyond what is usual, ordinary, regular, or established.
2) Exceptional in character, amount, extent, degree, etc. (Dictionary.com).
→ extra-; → ordinary.
When a beam of → unpolarized light is incident on a
→ doubly refracting crystal, there will be two refracted rays.
The ray for which → Snell's law does not hold.
→ extraordinary; → ray.
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