<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">refractive index</topic></authority><related type="other"><topic>refraction</topic></related><related type="broader"><topic>physical sciences concepts</topic></related><variant type="other"><topic>RI</topic></variant><variant type="other"><topic>index of refraction</topic></variant><variant type="other"><topic>index, refractive</topic></variant> <note xml:lang="en"><![CDATA[ Refers to the measurement of a material’s ability to deflect light, and is the ratio of the speed of light in a vacuum to the speed of light in the material. ]]></note></mads>