The extent of the change in direction of light in a given pair of transparent media
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Refraction: Introduction
The change of direction of light because of change of medium is known as Refraction or Refraction of Light. The ray of light changes its direction or phenomenon of refraction takes place because of difference in speed in different media.
The light travels at faster speed in rare medium and at slower speed in denser medium. The nature of media is taken as relative. For example air is a rarer medium than water or glass.
When ray of light enters from a rarer medium into a denser medium, it bends towards normal at the point of incidence. On the contrary, when ray of light enters into a rarer medium from a denser medium it bends away from the normal.
Ray emerging after the denser medium goes in the same direction and parallel to the incident ray.
ANSWER←(>▽<)ﾉ
Light, normally, travel along the straight-line paths in a transparent medium. ... In a given pair of media, the extent of the change in direction is expressed in terms of the refractive index.