I know you have all had enough of these kinds of posts, but this ones just good for a laugh:

http://www.kenrockwell.com/tech/diffraction.htm

Under the first paragraph in "MATH" -

"Diffraction is accurately predicted by both ray and wave theory." - Ken Rockwell

I took this from wikipedia, but to anyone who received their degree in "engineering, mathematics or physics as I did, this is easy" - Ken Rockwell

"Ray theory does not describe phenomena such as interference and diffraction" - Wikipedia http://en.wikipedia.org/wiki/Ray_(optics)

Oops!