| 1. | The optic axis figure of a biaxial mineral is more complex.
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| 2. | A crystal with only one optic axis is called a uniaxial crystal.
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| 3. | This means that it has more than one optic axis.
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| 4. | The ordinary axis is perpendicular to the optic axis.
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| 5. | The extraordinary axis is parallel to the optic axis.
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| 6. | This plane contains the chief ray, but does not contain the optic axis.
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| 7. | The optic axis of a crystal is a direction rather than a single line.
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| 8. | Non-crystalline materials have no double refraction and thus, no optic axis.
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| 9. | Uniaxial means it has only one optic axis.
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| 10. | This cartridge is inserted into an airlock with the bore perpendicular to the TEM optic axis.
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