#roberti-grossetestis-lector
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![Journal of the History of Ideas Volume 28 issue 3 1967 [doi 10.2307%2F2708626] Bruce S. Eastwood -- Grosseteste's Quantitative Law of Refraction- A Chapter in the History of Non-Experimental](https://static.cupdf.com/doc/330x215/55cf8c815503462b138d226a/journal-of-the-history-of-ideas-volume-28-issue-3-1967-doi-1023072f2708626.jpg)