Light is bent going through contact lenses, so they are refraction.
Concave lenses work by refraction of light.
refraction
Cameras do not refract light, lenses do. Refraction occurs whenever light passes from one medium to another, so it is not something that only occurs with lenses.
The behavior of light that enables optical lenses to magnify images is called refraction. refraction is the bending of light. This happens when light enters a medium with a different "index of refraction." Index of refraction is a property of a material that measures how much the material's electric and magnetic fields interfere with light (which is an electromagnetic wave). This interference slows light down. The way I understand it, the front of the way slows down before the back of the wave, causing it to change trajectory like a bullet in water. The change in trajectory is a property of the geometry of the system of lenses which include the magnifying lens, lenses in your eye, and the object being magnified. You can find diagrams online of how this works.
In Photography, refraction has the same rules as in physics. Well, photography is all about engineering and physics. Refraction encompasses the situation where light goes through a semi transparent object and the photons are slightly drifted from its normal course because the surface they hit separates them. You can see this effect inside a pool or when you look at your own reflection at a cracked mirror.
The longer the wavelength, the greater the angle of refraction.
c divided by the index of refraction of the medium = the speed of light in the medium.
Light passes through a lens, typically being bent by refraction. Light reflects off a mirror.
Refraction
Refraction ~ look to related link below .
When you wear glasses, the light is refracted so that your eyes can see images better. Microscopes and telescopes use refraction to change the perception of images. When you look into water and see objects in the water appear distorted, that is refraction.