point of incidence
point on a surface where the incident ray hits
Angle of incidence
the angle between the incident ray and the normal
Angle of reflection
angle between the reflected ray and the normal
1st law of reflection
the incident ray, reflected ray and the normal at the point of incidence all lie on the same plane
2nd law of reflection
the angle of incidence is equal to the angle of reflection
Refraction
the bending of light as light passes from one optical medium to another