You are given kerosene, turpentine and water. In which of these does the light travel fastest ?

Explanation

To determine in which medium light travels the fastest among kerosene, turpentine, and water, we can follow these steps:

### Step 1: Understand the concept of refractive index
The refractive index (μ) of a medium is defined as the ratio of the speed of light in a vacuum (c) to the speed of light in that medium (v). Mathematically, it is expressed as:
\[ \mu = \frac{c}{v} \]
This implies that a higher refractive index means a slower speed of light in that medium.

### Step 2: Identify the refractive indices of the given substances
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