Final answer:
The refractive index of glass is a measure of the speed of light in the material compared to its speed in a vacuum, affecting how light travels through it.
Explanation:
The refractive index (symbol n) of glass is the ratio of the speed of light in a vacuum to its speed in the material. It indicates how difficult it is for light to pass through the material. The refractive index varies with the wavelength of light; shorter wavelengths result in a higher index of refraction.
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