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This is the inside of the polychromator detector box. It's called a "polychromator", which means "many colours". Usually there is so little light in there that you can't see it as being split into the various colours. In this photo, however, we're doing a white light calibration. We shine a bright lamp into our detector box. The cards that you can see (the ones you see the coloured circles projected onto) are in there covering the phototubes to protect the ones we're not investigating in this particular calibration. A side effect of putting bright light in and covering off the tubes is that you can see the various colours allowed through the long-wave-pass filters. Light in the polychromator travels from right to left, and mirrors pick off short wavelengths and let through longer ones. You can see that by the time you're at the farthest left part of the box, red is the only colour remaining.
Photo Credit: Emily
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