Background: The optical constants of a glass material are very useful for determining its radiative properties, as well as for selecting the appropriate thin-film coatings on a glass substrate. Objective: The objective of this study is to calculate the real part (n) and the imaginary part (k) of the complex refractive index of a clear glass material using a simple method based on the reflectivity and transmissivity measurements. Methods: In this study, the parts n and k are derived from the equations of the reflectivity at near zero incidence and transmissivity at normal incidence by using Shimadzu IR-70 Spectrophotometer and Cary 5E Spectrophotometer apparatuses. Results: Current and future developments of the patents on Optical Constant of a Clear Glass Material are finally provided to calculate the real and imaginary parts of a clear glass material in the ultraviolet through the near infrared range based on reflectivity and transmissivity measurements at near zero and normal incidence, respectively. Conclusions: The real and the imaginary parts of the complex refractive index of the glass sample obtained in the present study are in very good agreement with Rubin’s data. Although, a direct comparison between different samples is not possible, due to the difference in manufacturing process and material composition.
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