Krüss offers the model SG1800 Spectrometer-Goniometer, for the exact measurement of optical data on prisms. Reflection angle and deflection angle are measurable. From the measured values, for example, the inner angle of a prism or the refractive index of the material used can be determined.
It can also be used as a spectroscope, for qualitative examination and
measurement of emission and absorption spectra. The observation tube has
combined coarse and fine drives, infinitely variable, cross-hairs,
eyepiece vernier accuracy. The collimator and the telescope have a focal
length of 178mm and a free aperture of 32mm. The Prism offers Flint
glass (60deg) with a dispersion angle C-F=2deg. The collimator is a
symmetric precision slit of hardened steel. Accessories include prism,
Rowland grating and holder, scale illumination, lamp, ocular and spectra
sheet.Infinitely adjustable