The smaller the hole (so far at least as geometrical optics is concerned) the less confused will the picture be.
Many other points of physiological optics are touched on, in general erroneously.
Herman, A Treatise on Geometrical Optics (1900).
Accordingly, for the next three or four years, he remained steadily at work, and nothing appeared from him in public except a short treatise on optics (Tractatus opticus, L.W.
But his researches in physical optics constitute his chief title-deed to immortality.
On his mother's death in 1759 Marat set out on his travels, and spent two years at Bordeaux in the study of medicine, whence he moved to Paris, where he made use of his knowledge of his two favourite sciences, optics and electricity, to subdue an obstinate disease of the eyes.
Archbishop Peckham, or Pisanus, in his Perspectiva Communis (1279), and Vitello, in his Optics (1270), also attempted the solution of Aristotle's problem, but unsuccessfully.
In optics he was the first, in 1802, to observe the dark lines in the solar spectrum.
His work was mainly concerned with electricity and magnetism, though he also made some contributions to optics and physiology.
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