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Movement of Light


Previous Entry Movement of Light May. 12th, 2006 @ 09:10 am Next Entry
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Date:May 13th, 2006 01:24 am (UTC)
Indeed, you are correct.

The theory on electromagnetic waves (forgetting about the particulate properties of light for a moment) does not require a medium in which to propagate. It's a bit unintuitive, but the waving is caused by the interaction between the electric and magnetic components of the wave. A varying electric field gives rise to a magnetic field (similar to an electomagnet), and a varying magnetic field gives rise to an electic field (similar to a generator). These field variations self-propagate through space, continuing on the "waving" though their mutual interaction.
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