can you explain me first "Law of Refraction"

Following are the two laws of refraction:

1. The first law of refraction states that- the incident ray, the refracted ray and the normal lie on the same plane.2. The second law of refraction also called the Snells Law states that- there is a constant relation between the angle of incident ray (i) and angle of refracted ray (r). This constant is the refractive index of second medium relative to the first medium.Wheren₁is the refractive index of first medium andn₂is the refractive index of second medium,v₁is thespeedof light in first medium andv₂is thespeedof light in second medium.