Optical glasses will be found in scientific instruments, microscopes, fighter aircraft and most commonly in spectacles.
The most important properties are the refractive index and the dispersion:
- Refractive index is a measure of how much the glass bends light.
- Dispersion is a measure of the way the glass splits white light into the colours of the rainbow.
Glass makers use the variations in these characteristics to develop optical glasses.
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The oldest examples of glass are Egyptian beads dating from 12,000 BC.