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Created with Fabric.js 1.4.5 The way the peacocks feathers are scattered leads to the different colors, iridescent colors Colored spots are caused by small bold shaped indentations in the feather Bright colors are causedby tiny detailed crystal structures The crystals in peacock feathers have uses in Telecom. Because of the different spacing of the crystals, the hue of the feathers will be different for every peacock The surface curvature of the barbules effect reflection properties Joe and Amy are watching Amy's pet peacock. Joe swears that the eyes of Dick's feathers are green (wavelength =495nm), but Amy says that they are blue (wavelength= 450nm). If the spacing between the feather bands is 1.8 x 10^3 nm, what is the index of refraction for tehpeacock feather according to both Joe and Amy? Example Problem! Iridescent Peacock Feathers: The Mystery Behind the Colors Iridescent Peacock Feathers: The Mystery Behind the Colors Different wavelengths of light are filtered and then reflected off the thin film of the feathers, causing the feathers to appear multi-colored. G (1): λ= 495 nm , d= 1.8 x 10^3 nmU: n=?E : 2d= (m+ 1/2) ( λ/n)S (1): λ/ (2d/ (m+1/2) =nS (1): 495nm/{2(1.8 x 10^3 nm)/ (1/2)}= .06875= 6.875 x 10^2G (2): 450 nm d= 1.8 x 10^3 nmU: n=?E/S: same as part 1 S (2): 450 nm / {2(1.8 x 10^3 nm)/ (1/2)}= .0625= 6.25 x 10^2 Works CitedColwell, Catharine. "PhysicsLAB." PhysicsLAB. Web. 6 Mar. 2015. <>."Patterns Interference Reading." Patterns Interference Reading. Arizona State University. Web. 5 Mar. 2015. <>.Pickrell, John. "Peacock Plumage Secrets Uncovered." National Geographic. National Geographic Society, 17 Oct. 2003. Web. 6 Mar. 2015. <>.
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