Spectrographic supplies a industry wide range of metallography equipment for cutting, mounting, grinding and polishing. We also supply quality hardness testers and microscopes. We only work with established brands and market leaders. We trial and test all our equipment, to ensure you, the client, receives only the best.
The refractive index of a glass is not equal throughout all of its wavelengths, it is greater in the shorter wavelengths and less in the longer wavelengths.
This results in light being focussed to a number of points dependant upon the wavelength – blue focussed nearer to the lens than red.
Optical glasses also have different refractive indices and dispersions (variation in refractive index with wavelength) and by the combination of lenses of differing optical properties in the system it is possible to limit the effect of the aberration.