Refractometry is an analytical method to measure the refractive index of a solid or liquid material. The refractive index is the ratio of the velocity of an electromagnetic wave in vacuum relative to its velocity in the material of interest. Refractive index can be measured between 1.30 and 1.71 at a wavelength of 589.3 nm, using an Abbe refractometer.
Characteristics of Abbe refractometer:
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