The first three significant digits of a sample’s refractive index are compensated by a standard, therefore a precise measurement, which is the same as the refractive index of the standard, can be obtained. The method only needs a thin sample.
© 1990 Optical Society of America
Yi Li, Chuanzeng Pan, and Guohua Li, "Refractive index measurement using a standard compensating method," Appl. Opt. 29, 4546-4547 (1990)