rus: Фокус оптической системы

Information
has URI	http://lexvo.org/id/term/rus/%D0%A4%D0%BE%D0%BA%D1%83%D1%81%20%D0%BE%D0%BF%D1%82%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%BE%D0%B9%20%D1%81%D0%B8%D1%81%D1%82%D0%B5%D0%BC%D1%8B

Meaning
means	(noun) a point of convergence of light (or other radiation) or a point from which it diverges focus, focal point