Refraction of Light - Snell's Law

The laws of refraction

1. The incident and refracted rays are on opposite sides of the normal at the point of incidence, and all three lie in the same plane.
2. The value of $\frac{\mathrm{sin}i}{\mathrm{sin}r}$ is constant for light passing from one given medium into another. This is known as Snell's law.

Snell's law states that the value of (sin i) / (sin r) is constant for light passing from one given medium into another. $sinr sini =constant$

Snell's Law