Answer:
Refraction is the bending of light (it also happens with sound, water, and other waves) as it passes from one transparent substance into another. This bending by refraction makes it possible for us to have lenses, magnifying glasses, prisms, and rainbows. Even our eyes depend upon this bending of light
in short:
the bending of a ray when it passes at an angle from one medium into another in which its speed is different (as when light passes from air into water) refraction
