🌐EnglishEnglishEspañolTürkçeРусскийفارسی中文EntityQ3566059· pop 12· linked from 62 articlesoptical mediummaterial through which electromagnetic waves propagateAvailable in 12 languagesEspañol中文РусскийBanglaCatalanCzechGreekHebrewTeluguUkrainianConnectionselectromagnetic radiationEntitylightEntityCategoriesElectric and magnetic fields in matterOptics