Optical glass
Crossword Clue

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AnswerCrossword Clue
LENSOptical glass.
LENSOptical glass
THORIAWhite, earthy powder used for optical glass
thoriaa powdery white oxide of thorium ThO2 used especially as a catalyst and in crucibles and refractories and optical glass
didymiumA mixture containing the rare earth elements praseodymium and neodymium, used to color glass for optical filters. It was originally regarded as a single element
lenseda piece of transparent material (as glass) that has two opposite regular surfaces either both curved or one curved and the other plane and that is used either singly or combined in an optical instrument for forming an image by focusing rays of light