🌐EnglishEnglishDeutschEspañolFrançaisNederlandsPolskiTürkçeРусскийفارسی中文日本語EntityQ1541210· pop 11· linked from 119 articlesGradient-index opticsScience of using a material's refractive index for optical effectsAvailable in 11 languagesEspañolFrançaisDeutschРусскийBelarusianChuvashNederlandsPolskiTürkçeفارسیConnectionsrefractionEntityChemical vapor depositionEntityCategoriesFiber opticsGlass engineering and scienceOptics