For all of you mad scientists out there with a laboratory in your basement and a craving for action movie scenes, I have a link that was given to me by a friend. If solar death rays are your thing, then definitely check this site out.
The premise is that a bunch of mirrors (112) at specific angles concentrate the sun at a point ~5ft from the center of the death ray. The owner of the site made the death ray themself, and certainly any of you would-be comic book villains can do the same.
Try not ....

Do It Yourself Solar