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Why do we see certain colours?

  1. Aug 19, 2010 #1
    When I look at an apple, why do I see it as red, and not another color in the visible EM spectrum? Is it determined on an atomic scale?
  2. jcsd
  3. Aug 19, 2010 #2
    Yes, it has to do with resonance frequencies for the electrons in the molecules on the surface of the skin. So even though you shine white light on the apple's skin, a majority of the reflected light is red.

    It is also known as absorption and stimulated emission.
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