General abstract nouns:
* Refraction: This is the most direct and common abstract noun, simply referring to the act or phenomenon of light bending.
* Bending: A more general term for the action of changing direction.
* Deflection: This emphasizes the change in direction caused by refraction.
* Dispersion: This refers specifically to the spreading out of light into its component colors during refraction.
More specific abstract nouns:
* Optical phenomenon: This captures the idea of refraction as a natural occurrence in light.
* Wave interference: This refers to the underlying physical process that causes refraction.
* Index of refraction: This is a specific property of a medium that determines how much light bends when passing through it.
Choosing the right abstract noun depends on the context and what you want to emphasize.