`n=(v)/(c)` where n denotes the refractive index of a medium, v the speed of light in the medium and c the speed of light in vacuum.

Explanation

To determine whether the statement \( n = \frac{v}{c} \) is true or false, we will analyze the relationship between the refractive index and the speeds of light in different media.

### Step 1: Understand the Definitions
- **Refractive Index (n)**: It is defined as the ratio of the speed of light in vacuum (c) to the speed of light in a medium (v).

\[ n = \frac{c}{v} \]
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