Plane mirrors are flat, smooth surfaces that reflect light in a predictable way. When light rays hit a plane mirror, they bounce off at the same angle they hit the mirror.
Reflection: The bouncing back of light when it hits a surface.
Incident Ray: The incoming ray of light that strikes a surface.
Normal Line: An imaginary line perpendicular to the surface at the point where the incident ray strikes.
AP Physics 2 - 6.5 Images from Lenses and Mirrors
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