(IMAGE)

INSERM (Institut national de la santé et de la recherche médicale)

Caption

On the left, the spectrum of the white light consists of roughly equal parts of red and green (about 40 percent), then blue (12 percent) and infrared waves (4 percent). On the right, the proportions are different (42 percent blue and 14 percent red). Nevertheless, with the naked eye, a human will perceive a white light in both cases.

Credit

Inserm/ Gronfier, Claude

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