The reflectance for a bowl-feed polished Cer-Vit sample was measured at nine wavelengths and five angles of incidence from 15° to 85°. Optical constants were derived by the reflectance-vs-angle-of-incidence method and compared to previously reported values for ultra-low-expansion fused silica (ULE) and several other glasses. Surface-roughness corrections of the reflectance data and optical constants are discussed.
John F. Osantowski, "Reflectance and optical constants for Cer-Vit from 250 to 1050," J. Opt. Soc. Am. 64, 834-838 (1974)