What key details about ludvig lorenz can be extracted from the following bio? Bio: ludvig valentin lorenz -lrb- january 18 , 1829 -- june 9 , 1891 -rrb- was a danish mathematician and physicist . he developed mathematical formulae to describe phenomena such as the relation between the refraction of light and the density of a pure transparent substance , and the relation between a metal 's electrical and thermal conductivity and temperature -lrb- wiedemann -- franz -- lorenz law -rrb- . lorenz was born in helsingr and studied at the technical university in copenhagen . he became professor at the military academy in copenhagen 1876 . from 1887 , his research was funded by the carlsberg foundation . he investigated the mathematical description for light propagation through a single homogeneous medium and described the passage of light between different media . the formula for the mathematical relationship between the refractive index and the density of a medium was published by lorenz in 1869 and by hendrik lorentz -lrb- who discovered it independently -rrb- in 1878 and is therefore called the lorentz -- lorenz equation . using his electromagnetic theory of light he stated what is known as the lorenz gauge condition , and was able to derive a correct value for the velocity of light . he also developed a theory of light scattering , publishing it in danish in 1890 and in french in his collected works , published in 1898 . it was later independently rediscovered by gustav mie in 1908 , so it is sometimes referred to as lorenz -- mie theory . additionally , lorenz laid the foundations for ellipsometry by using fresnel 's theory of refraction to discover that light reflected by a thin transition layer between two media becomes elliptically polarized .
The answer to this question is:
- known for is wiedemann equation lorenz gauge condition lorenz -- mie theory -- franz -- lorenz law lorentz -- lorenz- death date is 9 june 1891- ethnicity is denmark- field is physicist- birth date is 18 january 1829- name is ludvig lorenz- image size is 300px- nationality is danish- image is ludvig_valentin_lorenz . jpg- birth place is helsingr , denmark