optical film
preferred label: فیلم نوری @fa
type: Concept
related: dielectric film

dielectric materials
preferred label: مواد دی‌الکتریک @fa
type: Concept
narrower: dielectric film

thin film
preferred label: لایه نازک @fa
type: Concept
related: dielectric film

dielectric film
related: thin film
related: optical film
broader: film
broader: dielectric materials
preferred label: لایه دی‌الکتریک @fa
type: Concept

film
preferred label: فیلم @fa
type: Concept
narrower: dielectric film