Why does light propagate as a wave in a vacuum?

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whatzzupboy
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Why do we think of light as a wave if in a vacuum we still have light could it possibly be a bi product of multiple energie reacting on one another?
 
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According to wave-particle duality theorem, in different situations light either acts as an EM wave or a photon particle. What exactly do you mean by "multiple energy reacting with each other" ?
 
I ment could it be that when any pure form of energy bent (rearanged) by another create light