# Refraction of light

By jun, 4th Jul 2014 | Follow this author | RSS Feed | Short URL http://nut.bz/1ycd7ffe/
Posted in Wikinut>Guides>Science>Physical Forces

Refraction is the phenomenon by virtue of which a ray of light going from one medium to the other undergoes a change in its velocity.

## Refraction

Velocity of light in different media is different. As a ray of light goes from medium 1 (velocity of light v1) to medium 2 (velocity of light v2), its velocity changes on crossing the interface XY. This phenomenon is called refraction.
Refraction is the phenomenon by virtue of which a ray of light going from one medium to the other undergoes a change in its velocity.
If the ray is incident obliquely, as shown in fig. The change in velocity of light results in a change in its path also, while there is no change in path if the ray is incident normally. The ray which approaches the interface is called incident ray (SO). Ray which goes into the second medium is called refracted ray. Angle between the incident ray and the normal to the interface at the point of incidence is called the angle of incidence (i). Angle between the refracted ray and the normal to the interface is called the angle of refraction (r).
If light travels from an optically rarer medium to a denser medium, it bends towards the normal, i. e. , r is less than i. If it travels from denser to rarer medium, it bends away from the normal; i.e., r is greater than i.

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jun
I love to write any articles that I have knowledge.. Mainly computer and science related article