Happy St. Paddy’s Day 2009
Kathleen David | March 17, 2009
My father was a co-author on a book about lasers. I will always remember a drawing he did to show the difference between coherent and incoherent light. The coherent light showed a bunch of stick figures marching in the St. Paddy’s day parade before the bars opened in nice straight lines. Incoherent light are a […]
