The 'normal' direction is the direction perpendicular to a surface. Think of a stick with one end of it glued to a mirror. When a beam of light or a tennis ball hits the surface, the 'angle of incidence' is the angle between the normal and the direction the ball came from. The 'angle of reflection' is the angle between the normal and the direction the ball will take after the bounce. The angle of reflection will be equal to the angle of incidence. Knowing this, you can always place your bank shot exactly where you want it to go after the bounce.
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The angle of incidence
The angle of incidence is ALWAYS equal to the angle of reflection! This is one of the laws of reflection.
0(zero) Angle of incidence = angle of reflection
the angle of incidence is the initial ray angle and the angle of reflection is the reflected ray angle
For a smooth surface, the angle of incidence is the same as the angle of reflection.