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Created with Fabric.js 1.4.5 MORPHO BUTTERFLIES DIFFERENCE S EXAMPLE CONTINUED MORE ABOUT MORPHOS DATA EXAMPLE PROBLEM THIN FILM INTERFEREN CE Thin film interference is the result of construction and destructive interference caused by refraction in the thin film.Given white light, certain wavelengths will interact if their wavelength is a fraction of d (4λ=d). What is the wavelength of a morpho butterfly wing with a minimum thickness of 64 nm and an index of refraction of 1.5? G: d=64 nm, m=0, n=1.5U: λ=?E: 2d = (m+1/2) * λ/nS: 2d/(m+1/2) * n = λS: 2(64)/(0+1/2) * 1.5 = λλ=384 nm The underside of a morpho wing is brown, however, the butterfly appears to be blue because the slits in the scales of the morpho are 200 nm apart and corresponds to 1/2 of the λ of blue light. This λ undergoes constructive interference which causes the blue color. Most morphos have an index of refraction of 1.5 and a wavelength close to 400 nm. Look at the example problem and see if you get an answer close to 400 nm for λ! Works CitedMurphy, Douglas B., Kenneth R. Spring, Thomas J. Fellers, and MIchael W. Davidson. "Nikon MicroscopyU | Polarized Light Microscopy | Introduction to Interference." Nikon MicroscopyU | Polarized Light Microscopy | Introduction to Interference. N.p., n.d. Web. 06 Mar. 2015."Morpho+butterfly - Google Search." Morpho+butterfly - Google Search. Wikipedia, n.d. Web. 06 Mar. 2015."Deviant Art." Blue Morpho Butterfly Wings by Enchantedgal-Stock on DeviantArt. N.p., n.d. Web. 06 Mar. 2015. The blue color is caused by structures that are hundreds of nanometers in size. These structures are are arranged in rows which behave in the same manner as a diffraction grating. These structures also form a multilayer which causes the blue wavelengths of light to interfere constructively. Thus, while thepigment of the butterflies is brown, their color appears blue because of thin film interference.
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