Question

how do we see things that do not give out light

Answer 1

we can see them due to reflection .the light given by the luminous object falls on the non- luminous object and by falling light,the light gets reflected.thus,we are able to see things that do not give out light

Answer 2

we can see them due to reflection of light. But if light haven't bounced back we can see them because of the light coming from luminous body falling on non-luminous bodies and then gets reflected and reach our eyes