- the normal at a point on a mirror is a line drawn perpendicular to the mirror
- the law of reflection states that the angle of incidence = the angle of reflection
- for a light ray reflected by a plane mirror:
...the angle of incidence is the angle between the incident ray and the normal
...the angle of reflection is the angle between the reflected ray and the normal
- specular reflection is reflection in a single direction without scattering, diffuse reflection is refletcion from a rough surface that scatters the light
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