Iridescence of dragonfly wings is caused by structural coloration. When light passes through microscopic surface structures w/varying refractive indices, constructive & destructive interference occur. This enhances some wavelengths of light, creating vivid colors dependent upon viewing angle ๐งช๐๐ฅฝ๐ฉโ๐ฌ๐ฑ๐งฌโ๏ธ
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