British Sign Language Glossaries of Curriculum Terms

BSL Physics Glossary - angle of incidence - definition

Translation: A ray of light hits a surface at a point. From that point the line straight up, at 90 degrees to the surface, is called the normal. The angle between the normal and the ray of light is called the angle of incidence. You measure the angle from the normal, which is 0 degrees, to the ray of light.