If sunlight shines straight onto a peacock feather, the feather appears bright blue when
Chapter 17, Problem 53(choose chapter or problem)
If sunlight shines straight onto a peacock feather, the feather appears bright blue when viewed from 15 on e ither side of theincident beam of s unlight. The blue color is due to diffract.ionfrom the melanin bands in the feather barbules, as was shownin the photograph on page 549. Blue light with a wavelengthof 470 nm is diffracted at 15 by these bands (this is the firstorderdiffraction) while other wavelengths in the sunlight arediffracted at different angles. What is the spacing of the melaninbands in the feather?
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