___________ of electromagnetic radiation is visible to the human eye.
A narrow portion
The portion of electromagnetic radiation that is visible to the human eye is known as the visible spectrum. The visible spectrum includes all the colors of the rainbow and is composed of wavelengths ranging from about 400-700 nanometers (nm). This range of wavelengths corresponds to frequencies ranging from about 430-750 terahertz (THz). The color of visible light that we see is determined by the wavelength of the light that reaches our eyes. Red light has the longest wavelength and violet light has the shortest wavelength in the visible spectrum.
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