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January 9, 2012 05:11
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How we see color
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Without light there would be no color. Everything we look at is actually reflecting certain wavelengths of light and then absorbing the rest. The wavelength colors that our eyes can process are a part of the visible spectrum, a tiny sliver of the electromagnetic spectrum. The principle colors are, violet, blue, green, yellow, orange, and red. All light that we can see exists between the rainbow of violet on one end and red on the other. | |
Once light reflects off an object the wavelengths that weren’t absorbed make it into our eye. The lens focuses the light onto the retinal area that is made up of nerve endings called rods and cones. Rods are only sensitive to intensity or brightness. Color sensitive cones come in three types: the first is more sensitive to red, the second to blue and the third to green. These nerve endings turn light into electrochemical signals that are sent down the optical nerve to the brain. Then based on what is receive the brain interprets the signals and gives us sight. |
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