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Physics

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    $\begingroup$ I'd like to note that you can see the two parts of a typical white LED here: the blue spike is the LED itself, and the green-yellow hump is the phosphor which absorbs blue light and emits green-yellow. $\endgroup$
    – Dietrich Epp
    Commented Jul 31, 2014 at 20:53
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    $\begingroup$ Cue obligatory xkcd reference $\endgroup$
    – avalancha
    Commented Aug 1, 2014 at 11:07
  • $\begingroup$ Related: How many atoms does it take for us to perceive colour?. $\endgroup$
    – user21820
    Commented Jan 9, 2021 at 2:57