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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How to Cite

D. T. Nguyen, “Measuring the refractive index of a methanol - water mixture according to the wavelength”, Photonics Lett. Pol., vol. 13, no. 1, pp. 10–12, Mar. 2021.