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Light slows down when going through a medium. This is not to say that the speed of light, c, slows down. It doesn't - c remains constant - rather the light bounces randomly around the medium on its way to its destination, which increases the time it takes for the light to traverse through the medium.

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Q: What does light do when it travels through a medium?
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Why is it important to explain the speed of light together with the medium in which the light travels?

The speed of light is dependent on the medium it travels through. Light travels fastest in a vacuum than in water or air.


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