Incident ray, Light ray moving towards a surface or boundary., Reflected ray, Light ray leaving a surface or boundary., Ray diagram, Diagram that represents the direction and angle of travel of light., Angle of incidence, Angle between the normal and the incident ray., Angle of reflection, The angle between the reflected ray and the normal (the imaginary line drawn at 90 degrees to the reflecting surface)., Normal line, A line that is at an angle of 90° to a surface or boundary..

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