Question

What are the four conditions needed to see an object?

Answer 1

Four conditions need to be met for an object to be seen-an object, an eye, a source of light, and a direct, unblocked path between the object and the eye

hope this helps

Answer 2

I am sorry to say that I only know three of the four conditions, however I hope this helps anyways.

1) distance

2)direction

3)reference point.