With what speed would an electromagnetic wave move through a material with an index of refraction of 1.85?

The speed of electromagnetic wave in the material would be 1.162* 10⁸ m/s

Explanation:

We know that electromagnetic waves travel in a vacuum with the speed of the light i.e. 3*10⁸ m/s

Refractive index or index of refraction refers to the ratio of the speed of light/wave in vacuum to speed of the light/wave in a medium.

RI= speed of wave in vacuum (c) /speed of the wave in medium (v)

RI= c/v

v=c/RI

Substituting the values of RI as 1.85 and speed of wave in vacuum as 3*10⁸  m/s

v (speed of the wave in medium/material) = 3*10⁸ /1.85= 1.162 *10⁸ m/s

higher potential

explanation:

because it is in a high speed so it must move into a of high potential