refractive index
index of refraction

The refractive index of air is close to, but just greater than 1.

The refractive index of water at 20 C is 1.332986.

This is because oil has a refractive index greater than 1.

It is a clear oil with a refractive index of 1.5168.

This movement will always go into the material of higher refractive index.

The refractive index of the glass is the same everywhere.

Water has a different refractive index than air, so the path of light changes its direction.

In this paper he was able to show that refractive index may also be negative.

It is often represented in terms of a refractive index.

Water has almost the lowest refractive index you can find, 1.33.