If the shutter is opened, light entering the camera passes through the lens, which acts much like the human eye, and focuses on the inside of the back panel of the camera box.
(the shutter; is opened; ) (light; entering; the camera) (light entering the camera; passes; through the lens) (the lens; acts; much like the human eye) (the lens; focuses; on the inside of the back panel of the camera box)
the shutter light light entering the camera the lens the lens
is opened entering passes acts focuses
the camera
through the lens
much like the human eye
on the inside of the back panel of the camera box