DS DS/EN ISO 7944
DS DSEN SO 7944 1998-AUG-14 Optcs and optcal nstruments - Reference wavelengths
DS DSEN SO 7944 1998-AUG-14 Optcs and optcal nstruments - Reference wavelengths
This International Standard specifies two reference wavelenghts to be used for the characterization of optical materials, optical systems and instruments, as well as ophthalmic lenses. It defines the associated principal refractive indices and principal dispersion, as well as the Abbe number with regard to this reference wavelength and the principal dispersions.