Refractive index of glass is 1.5. It means that the speed of light in glass is 1.5 times slower than the speed of light in[[1]].

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Detailed Solution

Concept: Glass has a refractive index of 1.5. In other words, light travels at a speed that is 1.5 times slower in glass than it does in a vacuum.
The ratio of the speed of light in a medium to the speed of light in a vacuum is known as the refractive index. The atoms in a medium other than vacuum absorb and re-emit light particles as it travels through them, decreasing the speed of light. Let's discuss how well water and other media reflect light.
Refractive
A refraction index or index is another name for it. The characteristics of the medium affect how fast light travels across it. The optical density of a medium affects the speed of electromagnetic waves. Optically dense materials have a tendency to recover electromagnetic energy that has been absorbed. The optical density of a substance increases with the speed of light. One such indicator of a medium's optical density is its refractive index.
Absolute refractive index refers to a medium's refractive index in a vacuum. The refractive index of glass is 1.5. This indicates that the speed of light in glass is not independent of light colour and is 1.5 times slower than in a vacuum. The refractive index of the violet part of white light is greater than the red part.
Vacuum is the right response as a result.

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