Reply #3: Here's how I did it.. [View All]

[tridim]

Cut slits in the paper of different widths, make the slits as small as possible. Just big enough so you can see light passing through. Hair-width is a good target. Black paper would work best, but I just used regular copy paper.

CFL desk lamp about 3 feet away, slit about 6" from my eye, other eye closed, eye in "relaxed" focus like when viewing 3D stereograms.

Move the paper around and change your focus slightly until you find the best looking spectrum. The closer the slit is to your eye, the more detail you can see. You can also manipulate the slit width slightly by pulling and pushing both ends of the paper. The spectral lines only appear when the slit is as tiny as possible.

BTW I just tested it again this morning in case I was tripping last night. Yep, still works. :)