Colorless optical glass

There are specific requirements for optical constants, such as high visible light transmission and no selective absorption coloration. According to the size of Abbe number, it is divided into enamel and flint glass. The types are classified into several types according to the refractive index, and are arranged in order of refractive index. It is used as a lens, prism, mirror, etc. for telescopes, microscopes, cameras, etc.