Usage History of 'dioptrics'

The following chart shows how frequently 'dioptrics' appeared in printed materials over time. For example, the word 'dioptrics' occurred 4 times in books in 1667 and 975 times in 2008. From 1667 to 2008, the word 'dioptrics' was used a total of 35,758 times in books scanned by Google. See Reference: Google Ngram project.

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