Question

how can one see non-luminous objects?

Answer 1

In order for us to see an object that is non-luminous, it must reflect some of the light it receives from a luminous source, such as the Sun. Most of the objects we see, such as cars, clouds or even the Moon, are not luminous; it is just that they reflect sunlight.

Answer 2

We can see non - luminous objects when the incident rays of light get reflected and reach our eyes.It is due to this reason that we are able to see the moon glow in the sky at night because of the incident rays of the Sun.

Hope it helps you !!!