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Question

How does light actually propagate? I know that there are perpendicular electrical and magnetic fields and that they can induce other fields in space and this keeps going on so that light travels. Is this correct? Are there any differences between these magnetic fields?

Answer

It is indeed one of those mysteries! Light can travel through a vacuum, so it doesn't require anything to push it forward with. You can think of light as particles or photons and also as a wave. In fact, it behaves as both at different times! Put simply, light is an electromagnetic wave; so you get a changing electrical field, which in turn produces a changing magnetic field, which in turn produces a changing electrical field. This propagates indefinitely through space, at the speed of light, until it interacts with something.

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