In the case of the peacock, thin film interference takes place in three layers of keratin which cover the barbules. The light which passes through the keratin is retarded and therefore when it emerges from the keratin, some of the color components of white light are out of phase with the light-waves that were reflected from the front surface.
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http://www.wonderwhizkids.com/index.php/peacock-colors
http://www.wonderwhizkids.com/index.php/peacock-colors
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