Prisms were made from single crystals of rutile and sphalerite and used in measuring the refractive indices of these materials. The measurements were made through the visible spectrum and extended to 1.5 microns in the infrared by the use of an infrared sensitive screen.
The dispersion curves and the equations for the curves were determined. Values taken from the curves were found to agree moderately well with published values. The results demonstrate the high dispersion and the large birefringence of rutile. The experimental results also demonstrate the strong absorption of rutile in the violet end of the visible spectrum which accounts for the slight yellow color of rutile.
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