Electromagnetic waves travels through a space and through a medium at a different speed, the highest speed and em waves can travel in a vacuum is 300, 000 km/ s. But in a medium it speeds varies. A simple example we can take here is light , light have different speed in air, water and glass. The speed of light varies depending on the refractive index of the medium.
Therefore in
a vacuum the speed of em waves is constant but in any other medium the speed
decreases proportionally to the
refractive index of the medium.
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