In general, the refractive index varies based on the frequency of the light as well, thus different colors of light travel at different speeds. High intensities also can change the refractive index.

The top layer of liquid is pure water while the bottom layer is concentrated sugar water. In these layers, there is no change in refractive index and no bending of light. In the middle, a gradient ...

This is called refraction. The frequency of light does not change as it refracts. The refractive index of a material is a measure of the change in the speed of light as it passes from a vacuum (or ...

The gradient of this graph is the refractive index of the material of the semicircular block. So the ray emerging undergoes no change in direction as it leaves as the emerging ray leaves at 90 ...