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Light in the range of 390-700 nanometers (roughly 430-790 terahertz) is visible to most humans. This is in the top third of the EM spectrum roughly between the near ultraviolet and near infrared range.

So, the nonvisible portion of the spectrum is comprised of gamma rays, x-rays, extreme ultraviolet, most of the near infrared range, mid and full infrared, EHF, SHF, UHF, VHF, HF, MF, LF, VLF, voice frequency, SLF, and VLF.

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