Roger Bacon
(1214-94)
writes many works on the nature of light and optics (and some on magnetism). Greatly furthering the work of Grosseteste and Alhazen, and having access to and mastery of the major literature on optics, Bacon develops a unified framework for the understanding of light and geometric optics.
Robert Grosseteste
(1168-1253)
writes
De Iride and
De Luce on optics and light, experimenting with both lenses and mirrors.
R Bacon
writes many works on the nature of light and optics (and some on magnetism). Greatly furthering the work of Grosseteste and Alhazen, and having access to and mastery of the major literature on optics, Bacon develops a unified framework for the understanding of light and geometric optics.
Witelo
(d. 1281)
writes
Perspectiva around 1270, treating geometric optics, including reflection and refraction. He also reproduces the data given by
Ptolemy
on optics, though was unable to generalize or extend the study.
Theodoric of Freiberg
(1250-1310)
, working with prisms and transparent crystalline spheres, formulates a sophisticated theory of refraction in raindrops which is close to the modern understanding, though it did not become very well known. (
René Descartes
(1596-1650)
presents a nearly identical theory roughly 450 years later.)
Eyeglasses, convex lenses for the far-sighted, first invented in or near Florence (as early as the 1270s or as late as the late 1280s — concave lenses for the near-sighted appearing in the late 15th century).