<?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">optical concepts</topic></authority><related type="narrower"><topic>optics</topic></related><related type="narrower"><topic>resolution</topic></related><related type="narrower"><topic>color systems</topic></related><related type="broader"><topic>physics concepts</topic></related><variant type="other"><topic>concepts, optical</topic></variant><variant type="other"><topic>optical concept</topic></variant> <note xml:lang="en"><![CDATA[ Concepts related to the properties and phenomena of visible and invisible light, including its generation, transmission, and detection or perception. ]]></note></mads>