By doing this, the light bouncing off the mirrors can be focused on a point, or reflected away.
(the light; bouncing; L:off the mirrors) (the light bouncing off the mirrors; can be focused; on a point) (the light bouncing off the mirrors; reflected; away)
the light the light bouncing off the mirrors the light bouncing off the mirrors
bouncing can be focused reflected
L:off the mirrors
on a point
away