It means find something with a lens. Illuminating an object with a beam of light. Frame, adjust the lens. Ensure that an object is well framed with a lens to take a very sharp image. Directing a lens or camera toward a goal.
1 _ adjust the sharpness of an image through a lens. 2nd _ focus on a point a beam of light. 3rd _ figuratively, to focus attention on something.
FOCUS = projecting a beam of light or particles on a certain point.