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coherent

Primarygun
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What does coherent exactly mean? What does same phase difference refer to?

Why these two factors must be present so as to create interference?

What does coherent exactly mean? What does same phase difference refer to?

Why these two factors must be present so as to create interference?

 

Coherent means that the phase doesn't change with time or position (you can have spatial and/or temporal coherence). You measure phase from a particular point in the wave (e.g. the peak)

 

Why do you think a constant phase difference is important?

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