Conceptual understanding of wave terminology

[sillyjoe]

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When they say that light is either:

1. Coherent
2. Diffuse

What does it mean?

 

[Cawolf]

Rather than try to type out my interpretation, I first suggest you check out http://hyperphysics.phy-astr.gsu.edu/hbase/optmod/qualig.html#c4

If that doesn't answer your questions, let me know.