Оптические системы__

Optical systems - a collection of optical elements (refracting, reflecting, diffractive and others), designed to form specific bundles of light rays (in classical optics) or radio waves (in radio optics)... (Source: Wikipedia) The title of the website is "Оптические системы" (Optical systems). The description is "opticheskie sistemy" (optical systems), with keywords including "Оптическая система" (optical system), "оптические элементы" (optical elements), "преломляющие" (refracting), "отражающие" (reflecting), "дифракционные" (diffractive), "классическая оптика" (classical optics), and "радиооптика" (radio optics). The top_