All 5 Uses

focus
in
City of Bones
(Auto-generated)

Clary's eyes sprang open. Slowly the library came back into focus—the book-lined walls, the anxious faces of Hodge and Jace.
Chpt 10

focus = view (a state where something can be seen clearly)
Something about Jace sharpened him, brought him into focus. If she were going to draw them together, she thought, she would make Jace a little blurry, while Alec stood out, all sharp, clear planes and angles.
Chpt 11
The rune on the page seemed to spring into sharp focus, and she thought, involuntarily, Remember.
Chpt 13
She hadn't really focused on what a mess he was.
Chpt 16 *

focused = concentrated
Clary amused herself by letting her eyes fade in and out of focus, watching the glamour appear and disappear.†
Chpt 22 *

Definitions:

(1) (focus as in: Turn your focus to question #2.)
to direct attention or effort toward a single thing; or the ability to do so without getting distracted
(2) (focus as in: The focus of our study is...)
where attention is concentrated or directed
(3) (focus as in: bring into focus; or out of focus)
a state where something has come into view or can be seen clearly; or an adjustment made to permit a clear view
(4) (focus as with technical usage)
technical usage typically involves some sense of center or concentration such as:
- physics — a point where things come together such as the point where light rays meet
- geometry — a fixed reference point (as of a parabola)
- geology — the point of origin of an earthquake
See a comprehensive dictionary for other less common meanings.
(5) (meaning too rare to warrant focus)