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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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- Fall '11