When Grandma dropped a remote and the lens fell off, I found out that the lens that looks black is actually a very dark purple. Instead of taking the remotes apart, here I'm using an old camera with night vision to take pictures of the diodes in the remotes. On the right are the night shots, on the left are the regular pictures. The remotes work by sending flashes of ultraviolet light that are invisible to humans. The white circles on the night shot pictures are the diodes that send out the flashes. The camera works by sending out a similar wavelength which penetrates the lens, bounces back, and is received by the camera. If I took a video of it, I would see fast flashes of light.
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