Question

Show that n = `c/v`, where letters have usual meanings.

Answer 1

The refractive index of a medium is defined as the ratio of the speed of light in a vacuum to the speed of light in that medium.

So, n = `"Speed of light in a vacuum"/"Speed of light in that medium" = c/v`

This equation shows how light slows down in denser media, resulting in a refractive index greater than 1.