The angle of reflection is the angle the to the reflecting surface.
1. incident ray makes with a parallel line
2. incident ray makes with a perpendicular line
3. reflected ray makes with a perpendicular line
4. reflected ray makes with a parallel line

3. reflected ray makes with a perpendicular line

Explanation:

- The angle of incidence is defined as the angle between the incident ray and the perpendicular to the surface

- The angle of reflection is defined as the angle between the reflected ray and the perpendicular to the surface

According to this second definition, we see that the correct answer that completes the sentence is (3):

The angle of reflection is the angle the 3. reflected ray makes with a perpendicular line to the reflecting surface.

The law of reflection also states that the angle of reflection is equal to the angle of incidence.

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