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Most of you I'd bet know that white light has multiple wavelengths, and for those of you who took physics, you may have done a laboratory experiment where you viewed a lamp, such as a mercury vapor lamp, through a diffraction grating and observed the color lines.
It's not the easiest of labs, because everyone's vision is different, and for some reason, it seems that a disproportionate number of science/math/engineering students wear glasses instead of normal vision or at least contacts - and glasses induce a variety of weird effects to this.
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