Kerosene, turpentine, and water have different refractive indices 1.44,1.47 and 1.33 respectively. Light will travel at its fastest in which of the following?

The refractive index is the ratio between the speed of light in a vacuum to the speed of light in a certain medium.

It is a quantity with no dimensions.

For the refractive index,

n = c/v

where, n = Refractive index

             c = Velocity of light in a vacuum

             v = Velocity of light in a specified medium.

According to the formulas, the Refractive index has an inverse relationship to the speed of light.

If the material's refractive index is high, the light's speed will be low, and vice versa.

Here, The refractive index of kerosene = 1.44

          The refractive index of turpentine = 1.47

          The refractive index of water =1.33

 Turpentine has the greatest refractive index, so the speed of light will be slow.

As a result of having the lowest refractive index of all, water has the fastest light speed.