<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31321565</termId><termName>Fresnel lenses</termName><termType>PT</termType><termNote><![CDATA[ Plano-convex lenses thinned by reducing the convex side to a series of concentric rings of approximately the same focal length; when light passes through, it produces a smooth, soft-edged beam of light. ]]></termNote><termCreatedDate>2026-03-30 20:26:41</termCreatedDate><relation><relationType>UF</relationType><termId>31321566</termId><termName>Fresnel lens</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31321567</termId><termName>lenses, Fresnel</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31306461</termId><termName>lenses</termName><termType>PT</termType></relation></term>  </Zthes>