| 11. | A uniaxial crystal is isotropic within the plane orthogonal to the optic axis of the crystal.
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| 12. | Diamond and other optic axis ( a direction of single refraction in a doubly refractive material ).
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| 13. | This unique axis is called the extraordinary axis and is also referred to as the optic axis.
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| 14. | Trigonal, tetragonal and hexagonal crystals have a single optic axis, parallel to the c crystal axis.
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| 15. | The observations noted an optic axis persisting in materials that had been melted and had begun to flow.
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| 16. | The optic axis can be the fast or the slow axis for the crystal depending upon the material.
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| 17. | Although quartz has a substantial linear birefringence, that effect is cancelled when propagation is along the optic axis.
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| 18. | A waveplate works by shifting the optic axis of the crystal is parallel to the surfaces of the plate.
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| 19. | Those sections are most useful which are perpendicular to an optic axis, and consequently remain dark on rotation.
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| 20. | When the light propagates either along or orthogonal to the optic axis, such a lateral shift does not occur.
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