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All that I've been able to deduce from my research is that light acts in such a way because a longitudinal wave requires a medium, where a transverse does not.
A longitudinal wave propagates through compressions and rarefractions, which would require a medium. Space is empty and therefore provides nothing to compress and rarefract, which is why you don't hear sound (longitudinal waveform) in space, because a sound wave cannot travel through it.

Therefore, light MUST be a transverse wave if it is to propagate through a vacuum.

Sorry if it's not a very comprehensive answer, but it's all I can find.

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15y ago

What else can I help you with?