When we are looking at an object, light from it enters our
. Most objects do not
their own light. Light from other sources reflects from them, and it is this our eyes detect.
During daylight,
is the main source of this light. During the
, our eyes can use what little light is available, enabling us to make out some shapes. To help us, we have artificial light sources like
and car headlights to help us. In total
, we are not able to see at all.