Speed Index is a system that is used by the American Quarter Horse Association to rate the performance of racehorses. Speed Index is calculated by averaging the fastest three winning times over the past three years.
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The index of refraction of a substance is inversely proportional to the speed of light in that substance. This means that as the index of refraction of a substance increases, the speed of light in that substance decreases.
The index of refraction of a substance is(The speed of light in vacuum) divided by (the speed of light in the substance) .
The speed of light in any medium isspeed of light in vacuum/refractive index of that medium.
It will usually change. Usually you would expect the speed to decrease, but note that the "optical density", i.e. the index of refraction, is not entirely related to the density (as defined by mass/volume).
Refractive index is a measure of how much light bends as it passes from one medium to another. It is defined as the ratio of the speed of light in a vacuum to the speed of light in the medium. A higher refractive index indicates a slower speed of light and more bending.