They make night vision equipment possible ultraviolet

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Unformatted text preview: or is one that absorbs only one primary light color and reflects the other two primary colors. Thus yellow, magenta, and cyan are the primary colors for pigments. Yellow reflects red & green, cyan reflects green & blue, and magenta reflects red & blue. Secondary pigments colors then are blue, green, and red because they absorb two primary light colors and reflect their own light color back. The Electromagnetic Spectrum The electromagnetic spectrum covers a wide range of wavelengths and photon energies. Visible light ranges from 400 to 700 nanometers. About 550 nanometers, which is a yellowish green, is the wavelength to which our eyes are most responsive. Only a small portion of the electromagnetic spectrum is visible to us. The smaller the wavelength, the more energy each photons of the light has. Electromagnetic Spectrum (cont.) Wavelengths other that visible light serve useful purposes: Radio waves are very long (a few centimeters to 6 football fields) and can be used to send signals. These signals are transmitted by radio stations. They transmit information and music via amplitude modulation (AM) and...
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