Question

how does light enable us to see non - luminous

Answer 1

When light falls on an opaque object, it is reflected by the object and the light enters our eyes. Thus, we are able to see non luminous objects.

Hope it helps...

Answer 2

The bodies which don't emit night by their own, but the become visible (or shine ) by the light falling on them from luminous body , are fallen non luminous Bodies.