Back আলোক মাধ্যম Bengali/Bangla Medi òptic Catalan Optické prostředí Czech Οπτικά μέσα Greek Medio óptico Spanish محیط نوری Persian תווך אופטי HE Оптическая среда Russian యానకం(కాంతి) Tegulu 光學介質 Chinese
In optics, an optical medium is material through which light and other electromagnetic waves propagate. It is a form of transmission medium. The permittivity and permeability of the medium define how electromagnetic waves propagate in it.