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What is color?
Question Date: 2013-04-16
Answer 1:

Color is the way we perceive different wavelengths of light. Light travels in waves, and waves have a property called wavelength, which is the distance from peak to peak of the wave. Visible light ranges from 400 to 700 nanometer wavelengths (a nanometer or nm is one billionth of a meter). Violet light starts at about 400 nm and the visible spectrum includes the colors of the rainbow and ends with red light at about 700 nm.

The diagram below shows which colors correspond to which wavelengths. I took this image from wikipedia (http://en.wikipedia.org/wiki/Color)

click here for image

When a color of light enters our eyes, cells in our eyes can detect it and send a signal to our brains telling us what color we see.

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