The speed of light in a material depends on the refractive index of the material — a relationship given by:
, where v is the speed of light in a medium, c is the speed of light in a vacuum (which is constant), and η is the refractive index.
In our equation, we see that the speed of light in a material is inversely proportional to the refractive index of that material.
In which of the following materials is the velocity of light greatest?
C. Fused quartz
D. Crown glass
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