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The speed of light, c is greatest in a "vacuum" and is slowed when passing through transparent mediums such as water, glass and crystals. Different mediums reduce the rate of c differently, depending on a number of factors.

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Is the speed of light is the same in every medium?

No; a denser medium will slow the light down. When the speed of light is quoted, unless otherwise stated, it is implied that it's through a vacuum. The primary example of this is the speed light travels through water or glass. The different speeds are what create the rainbow effect, essentially splitting the light by slowing down different wavelengths at a different rate.


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Will earth always spin at this speed if no how will it change?

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What is a speed that doesn't change?

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What happens to your speed if you have a negative acceleration do you speed up or slow down?

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What is the speed of light using quartz as your medium?

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