Measuring the refractive index of a methanol - water mixture according to the wavelength

Dung Tien Nguyen, Le Canh Trung, Nguyen Duy Cuong, Ho Dinh Quang, Dinh Xuan Khoa, Nguyen Van Phu, Chu Van Lanh, Nguyen Thanh Vinh, Do Thanh Thuy, Bui Dinh Thuan


The refractive index of the methanol-water mixture depending on the wavelength at different concentrations was determined by our experimental method using a Michelson interferometer system. A comparative study of Gladstone-Dale, Arago–Biot and Newton relations for predicting the refractive index of a liquid has been carried out to test their validity for the methanol-water mixture with the different concentrations 30%, 40%, 50%, 60%, 80%, and 100%. The comparison shows the good agreement between our experimental results and the results in the expressions studied over the wavelength range approximately from 450 to 850 nm.

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