Willebrord Snell

lived from 1580 to 1626

Willebrord Snell was a Dutch mathematician who is best known for the law of refraction, a basis of modern geometric optics; but this only become known after his death when Huygens published it.

Find out more at:
http://www-history.mcs.st-andrews.ac.uk/Mathematicians/Snell.html