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## Main Question or Discussion Point

I am familiar with the idea of amplitude increases that can be produced by waves that are "in phase". I can imagine this easily with sound or water. I have 2 questions with regard to EM radiation:

1) Do the same principles apply with light/EM radiation? What does "in phase" mean on a practical level for say visible light?

2) If two light/EM sources are put at right angles to each other such that the beams intersect, what sort of interactions/amplifications might you get?

I realize these may be huge questions, so feel free to tell me to find a physics prof to sit down for coffee with. :)

THanks

1) Do the same principles apply with light/EM radiation? What does "in phase" mean on a practical level for say visible light?

2) If two light/EM sources are put at right angles to each other such that the beams intersect, what sort of interactions/amplifications might you get?

I realize these may be huge questions, so feel free to tell me to find a physics prof to sit down for coffee with. :)

THanks