________: Some substances (synthetic fibers, some crystalline solids) have two different refractive indices depending which way the light passes through the substance.
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Gemstones
________ can also be identified through density and refractive index.
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Glass
________ does not have birefringence.
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Becke line
The ________ is on the side of the substance that has the higher refractive index.
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edge of the glass
The Becke line is on the side of the substance that has the higher refractive index. The ________ fades as it gets close to a matching refractive index.