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The speed of light depends on the electrical properties of the medium (stuff) it's traveling
through. Its speed is maximum in vacuum ... 299,792,458 meters per second ... and it has
different speeds in any material ... e.g., air, water, glass, jello, etc. As long as the light stays
in the same material, its speed doesn't change.

In water, the speed of light depends slightly on the wavelength of the light. For the
wavelength of 400 nm (reddish light), the refractive index of water is about 1.34 ,
so the speed of that light is about 223,700,000 meters per second ... 25.4% less
than it is in vacuum.

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12y ago

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