The speed of light traveling in a vacuum is currently defined as 299,792,458 meters per second. That is approximately 186,282 miles per second. Note: The speed of light is dependent on the medium through which it travels. Its speed is lower when moving through transparent substances such as glass or water. When crossing a boundary between one substance and another, the speed of the light wave changes but the frequency does not. Consequently the wave bends. How far it bends depends on the length of the wave. It is this feature that makes a rainbow possible.
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