What does refraction mean?
Refraction is the bending of a wave when it passes from one medium into another. It is most commonly associated with light traveling through substances such as air, water, and glass, whose differing densities affect the speed and direction of the wave. Refraction is distinct from reflection: a reflected wave bounces from a surface, while a refracted wave enters a new medium and changes direction. The phenomenon explains why a pencil appears bent in a glass of water, why pools can appear shallower than they are, and why prisms separate white light into colors. In more general writing, refraction can figuratively describe the way an idea, fact, or cultural practice is altered as it passes through institutions, communities, or interpretive perspectives. The word is especially useful in science, but its figurative sense can also help describe the distortions involved in communication and cultural exchange.
nounRefraction is the bending of a wave, especially light, when it passes from one medium into another with a different density. More broadly, it refers to a change in the direction or character of something as it passes through a medium or system.
- The change in direction of a wave as it passes from one medium into another, particularly when light enters glass, water, or another material.
- A figurative alteration or distortion of something, especially information, an account, or a social or cultural phenomenon, as it passes through a particular system or perspective.
"The refraction of sunlight through the glass created a bright patch on the table."
"The prism's refraction separated white light into its component colors."
"The report's conclusions reached the public through the refraction of several media and institutions."
The plural is used for separate instances of refraction or for multiple occurrences of the phenomenon.
"The different refractions of the beam produced several bright points on the screen."
Refraction is the everyday bending behind a straw in a glass, a swimming pool that looks shallower than it is, and the colors spread across a rainbow.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does refraction come from?
Refraction comes from Latin refractio, a noun formed from refractus, the past participle of frangere, meaning “to break.” The prefix re- combined with frangere in the sense of breaking or bending, giving the idea of a ray being broken in direction. English borrowed the word in the 17th century for the bending of light, and later extended it figuratively to other forms of change or distortion.
Related word forms
How refraction is actually used
In scientific contexts, refraction is standard technical terminology and is usually discussed with reference to waves, light, angles, and media. The figurative sense is less common and can suggest distortion or mediation rather than ordinary change.
Easily confused with refraction
Reflection occurs when a wave bounces off a surface, whereas refraction occurs when it changes direction as it passes from one medium into another.