Malus, Étienne Louis (1775–1812)

Etienne Malus

Étienne Malus was a French physicist who, in 1809, announced his discovery of the polarization of light by reflection. In 1810 Malus also produced a theory of double refraction of light in crystals. Earlier in his career, in 1798, he had taken part in the invasion of Egypt as a member of the engineer corps in the army of Napoleon I.