Tones of Pictures, Most Commons and Mnemonics

Monday, September 10, 2007

Negative Birefringence

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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