Light is made up of waves, and these waves each have different wavelengths. If there is a short distance between waves, this is a high frequency. If there is a short distance, this is a low frequency. The way our eyes perceive these wavelengths impacts what color we will see. We cannot see all wavelengths, but the ones we can see that travel from the sun are considered visible light. The spectrum of visible light is seen as the colors of the rainbow from the longer wavelength frequency, red, through orange, yellow, green, blue, indigo, and finally violet with the shortest frequency. Seeing all of these together is known as white light.
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