Meaning of FOCUS in English

(SCIENCE) [noun] [C] [plural] focuses or [formal] foci - (in physics) the point where waves of light or sound which are moving towards each other meetthe focus of a lensA photograph that is in focus has a clear image.A photograph that is out of focus, it is not clear.(figurative) The recent shootings have brought the whole issue of firearms into much sharper focus (= made it more noticeable).

Cambridge English vocab.      Кембриджский английский словарь.