Combining light beams question

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When you combine two light beams with a half-silvered mirror, do you get a mixture or a superposition?
 
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It depends on how the two light beams were generated. If they're coming from two separate sources, it's a mixture. To get a superposition, the incoming beams have to be coherent to begin with.
 
Thanks, Bill.
Is there any other way to get a superposition of independent beams?
TIA. Jim Graber
 

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