Usage History of 'refractions'

The following chart shows how frequently 'refractions' appeared in printed materials over time. For example, the word 'refractions' occurred 4 times in books in 1657 and 5,244 times in 2008. From 1657 to 2008, the word 'refractions' was used a total of 162,693 times in books scanned by Google. See Reference: Google Ngram project.

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