http://www.flickr.com/photos/waiferx/3577304878/
Originally uploaded by Waifer X
Flickering infrared beam from DVD remote, while not visible to the naked eye, is detectable with a charged-coupled device (CCD) found in digital cameras. Video by Cuesta College Physical Sciences Division instructor Dr. Patrick M. Len.
http://www.flickr.com/photos/waiferx/3577276128/
Originally uploaded by Waifer X
"Invisible" ink puzzle on the back of a Milky Way bar Star Wars promotional package, normally not visible to the naked eye, but made visible when illuminated by an ultraviolet lamp, causing the ink to fluoresce in the visible spectrum. Video by Cuesta College Physical Sciences Division instructor Dr. Patrick M. Len.
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