🌐EnglishEnglishFrançaisفارسی中文EntityQ3454804· pop 5· linked from 24 articlesNegative refractionelectromagnetic property induced by some exotic optical materialsAvailable in 5 languagesFrançais中文Tamilفارسیvia Wikidata sitelinks · CC0Connectionswave vectorEntityopticsEntityCategoriesMetamaterialsPhotonicsPhysical phenomena