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In his scientific treatise entitled De Lineis, Angulis et Figuris, seuFractionibus et Reflexionibus Radiorum, Robert Grosseteste is discussing somequalitative geometric rules about reflection and refraction. However, he isalso discussing about the power of reflected and refracted light. The readingof these discussions is quite interesting, and what Grosseteste is tellingseems well-posed, when compared with the Fresnel reflectance.

Reflection and refraction in Robert Grosseteste's De Lineis, Angulis et Figuris