The speed of light in a material depends on the refractive index of the material — a relationship given by:

$\overline{)\begin{array}{rcl}{\mathbf{\eta}}& {\mathbf{=}}& \frac{\mathbf{c}}{\mathbf{v}}\\ {\mathbf{v}}& {\mathbf{=}}& \frac{\mathbf{c}}{\mathbf{\eta}}\end{array}}$, 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?

A. Air

B. Water

C. Fused quartz

D. Crown glass

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