Refractometer
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Definition
A gemological instrument that measures a polished gemstone's refractive index by determining the critical angle at which total internal reflection occurs between the stone and the instrument's reference glass.
Detailed Explanation
Instrumento gemológico que mede o índice de refração de uma gema polida determinando o ângulo crítico no qual ocorre a reflexão interna total entre a pedra e o vidro de referência do instrumento.