When you play billiards you will notice that when a ball bounces from a surface, the angle of rebound is equal to the angle of incidence. This observation is also true with light. When an incident light ray strikes a smooth surface (like a plane mirror) at an angle. The angle formed by the incident ray measured from the normal is equal to the angle formed by the reflected ray.
Law of Reflection -
The angle of incidence is equal to the angle of reflection. The reflected and incident rays lie in a plane that is normal to the reflecting surface.
Note: The red line represents the normal line. The normal line is always perpendicular to the reflecting surface.
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