当折射棱镜折射角很小时，称之为光楔。
It is called the optical wedge, when the refraction Angle of the refracting prisms is tiny.
光通过棱镜时产生折射。
但是蓝色羽毛是靠折射光形成的，那是羽毛中一些类似棱镜的结构将蓝色光分离了出来。
But blue feathers result from refraction, a prism-style splitting of light inside a feather.
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