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<p class="MsoNormal">Cosmic-ray photons, gamma rays, x-rays, ultraviolet radiation, visible light, infrared radiation, microwaves, and radio waves are all part of electromagnetic spectrum. In-between infrared and ultraviolet are the part of the electromagnetic spectrum that the human eye perceives. It is a tiny sliver of the electromagnetic spectrum, of about 430 to 750 THz frequency.</p>