uniaxial crystal

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Figure 20: Wave surface for (A) positive and (B) negative uniaxial crystals.

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uniaxial crystal

physics

Learn about this topic in these articles:

hexagonal system

In hexagonal system
…system are classed as optically uniaxial, meaning that light travels through the crystal at different speeds in different directions.
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optical crystallography

In optical crystallography
Optically uniaxial crystals (tetragonal, hexagonal, and rhombohedral [or trigonal] systems), which exhibit double refraction and yield two refractive indices for light of each colour, one parallel to the optical axis and one perpendicular to the optical axis;
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pleochroism

In pleochroism
…dichroism, which is found in uniaxial crystals (crystals with a single optic axis), and trichroism, found in biaxial crystals (two optic axes). It can be observed only in coloured, doubly refracting crystals. When ordinary light is incident on a crystal exhibiting double refraction, the light is split into two polarized…
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