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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