The speed of light in crown glass with the index of refraction is 1.97×10^8 m/s.
Given index of refraction= 1.52
speed of light in vaccum= 3×10^8 m/s
speed of light in medium=c/n= 3×10^8/1.52= 1.97×10^8 m/s
About index of refraction:
The ratio of the speed of light in a vacuum to that in a second medium with a higher density is used to compute the refractive index (also known as the index of refraction). In mathematical formulae and descriptive writing, the letter n or n' is most frequently used to represent the refractive index variable.
The index of refraction controls how much light is refracted or twisted when it enters a substance.
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