Light eyes (Visible light) is just one part of the electromagnetic waves. During which the human can touch of, which has a wavelength between 400 – 700 nm (1 meter = 1,000,000,000 nm) If you bring a glass Prism bars (Prism) refraction of solar, we can see that the white light is a refraction purple, green, yellow, Orange, red, blue, Indigo, similar to the colors of the Rainbow, eating water called "spectrum" (Spectrum) light, each color has a different wave length.
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