The speed of light in glass is `2 xx 10^(5)` km/s. What is the refractive index of glass?

Explanation

To find the refractive index of glass given the speed of light in glass, we can follow these steps:

### Step 1: Understand the formula for refractive index
The refractive index (n) of a medium is defined as the ratio of the speed of light in vacuum (c) to the speed of light in that medium (v). The formula is:
\[ n = \frac{c}{v} \]

### Step 2: Identify the values
- The speed of light in vacuum (c) is approximately \( 3 \times 10^8 \) m/s.
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