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IR is electromagnetic radiation with longer wavelengths than those of visible light at 0.74 micrometres (µm) to 300 µm, which is extends the nominal red edge of the visible spectrum.

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Some electronic devices' remote controls have their IR-diode covered with some glossy, dark acrlyic-glass like screen, others dont and you can directly see (and possibly touch) the IR-diode. What is, …
asked Oct 17 '15 by t0bias