refraction

The turning or bending of any wave, such as a light or sound wave, when it passes from one medium into another of different optical density.

The apparent change in position of a celestial object caused by the bending of light rays as they enter Earth’s atmosphere.

The ability of the eye to bend light so that an image is focused on the retina.

Determination of this ability in an eye.

The act of refracting, or the state of being refracted: almost exclusively restricted to physics, and applied to a deflection or change of direction of rays, as of light, heat, or sound, which are obliquely incident upon and pass through a smooth surface bounding two media not homogeneous, as air and water, or of rays which traverse a medium the density of which is not uniform, as the atmosphere.

In logic, the relation of the Theophrastian moods to the direct moods of the first figure.

The act of refracting, or the state of being refracted.

The change in the direction of ray of light, heat, or the like, when it enters obliquely a medium of a different density from that through which it has previously moved.