Assertion: germanium | /r/ObjectUse | used in infrared optical glasses
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Source sentences:
text: Germanium is also used in infrared optical glasses that can be readily cut and polished into specialty lenses in cameras; for passive thermal imaging; for hot-spot detection in night vision systems; and for firefighting applications.
text: Germanium is also used in infrared optical glasses that can be readily cut and polished into specialty lenses in cameras; for passive thermal imaging; for hot-spot detection in night vision systems; and for firefighting applications.