The light that is visible to the eye (Visible light) as a part of the electromagnetic waves. During wave 400 – 700 nm (1 m = 109 nm or 100 million nm) If the led bar glass Prism refraction from the Sun, we can see that the white light is refraction into the yellow, green, blue, Indigo, magenta, Orange and red, similar to the colors of the Rainbow, eating water called "spectrum" (Spectrum) light, each color has a different wave length. Purple is the smallest wave length. Red wavelength most. In addition to the light that the eye sees, and there are also other kinds of electromagnetic waves, as shown in Figure 2:
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