What is refraction of light? Explain the laws of refraction.

(N/A) Refraction of light is the phenomenon of change in the path of light as it travels obliquely from one transparent medium to another. This change in direction occurs because the speed of light changes as it moves from one medium to another.
Laws of Refraction:
$1$. The incident ray,the refracted ray,and the normal to the interface of two transparent media at the point of incidence all lie in the same plane.
$2$. Snell's Law: The ratio of the sine of the angle of incidence $(i)$ to the sine of the angle of refraction $(r)$ is constant for a given pair of media and a given color of light. Mathematically,$\frac{\sin i}{\sin r} = n_{21}$,where $n_{21}$ is the refractive index of the second medium with respect to the first.