The symbol is (theta i) which looks like a 0 with a line through it and a little i beside it on the bottom right corner
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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.