Explanation:
With the change in medium the speed of light wave travel changes. Therefore, the absolute refractive index changes. The speed of light is maximum is vacuum and changes with the change in medium. This is the refractive indices of different medium are different.
The refractive index is the characteristic of the wave that can not change as the wave enters the second medium.
The refractive index of a substance also known as the refraction index or index of refraction is a dimensionless quantity that specifies how quickly light passes through it in optics.
When the refractive index of a substance is increased, the speed of light in the material decreases.
The speed at which light waves travel changes as the medium changes. The absolute refractive index changes.
As a result, the speed of light is greatest in a vacuum and decreases as the medium changes. This is due to the fact that the refractive indices of various media are different.
Hence the refractive index is the characteristic of the wave that can not change as the wave enters the second medium.
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