hi... Got to ask about superpostion of waves... When two coherent light waves cross each at some point in space moving in different directions, do they superimpose? If they do, do we need a screen to be able to see the resultant or we can see it directly. Let's just assume we have a laser and with some sort of mirror arrangement we make the incident ray meet the reflected ray. The point where they meet can we see constructive or destructive interference (assuming 100% reflection and no losses)? Thanks for any help!