Liquid crystals are found to be birefringent, due to their anizotropic nature. That is, they demonstrate double refraction (having two indices of refraction). Light polarized parallel to the director has a different index of refraction (that is to say it travels at a different velocity) than light polarized perpendicular to the director.
Negative birefringence – yellow when is parallel to the light, and blue when is perpendicular.
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