The first spectacles utilized quartz lenses since optical glass had not been developed.
2.
However, because the sensor is only sensitive to long-wavelength UV, a quartz lens is not required.
3.
A curiosity was an ultrapure quartz lens found near Saint-Paul-la-Roche with parallel C-surfaces belonging to a C / S fabric.
4.
Cyclops, a mutant who can fire a concussive, explosive beam of red light from his eyes _ a beam which can be controlled only by a visor holding ruby-quartz lenses.
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