Appendix 3: Optical Materials


Optical glass is mainly determined by the value of two constants, namely, the refractive index and the Abbe constant. A diagram of the Abbe number Vd versus the refractive index nd for Schott glasses is shown in Figure A3.1. Besides the refractive index for the d line, several other quantities define the main refractive characteristics of the glass. The difference (nFnC) is called the principal dispersion. The Abbe value expresses the way in which the refractive index changes with wavelength. The Abbe value Vd for the d line is defined as



There are many types of glass, but a common broad classification is as follows:

a.  Crown glasses are those with a relatively ...

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