🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPortuguêsSvenskaРусскийالعربيةفارسیไทย한국어中文日本語EntityQ1071734· pop 24· linked from 50 articlesparaxial approximationsmall angle approximation in geometric opticsAvailable in 24 languagesEspañolFrançaisDeutsch中文日本語РусскийPortuguêsItalianoالعربيةAlbanianConnectionsrayEntityWolfram ResearchCompanyCategoriesGeometrical optics