Assertion: dispersion's effect | /r/CapableOf | produce optical fibers
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text: If the refractive index of a medium is not constant, but varies gradually with position, the material is known as a gradient-index or GRIN medium and is described by gradient index optics.:273 Light traveling through such a medium can be bent or focused, and this effect can be exploited to produce lenses, some optical fibers and other devices.