Final answer:
The law of reflection states that the angle of incidence is equal to the angle of reflection, measured relative to the normal of the surface at the point of contact(option 1).
Step-by-step explanation:
The law of reflection states that the angle of incidence is equal to the angle of reflection. This fundamental principle of optics applies when light rays strike a smooth surface, such as a mirror. The angles are measured from the light ray to a line perpendicular to the surface, known as the normal, at the point of incidence where the ray hits the surface.
In terms of choices provided, the correct answer is 1) angle of incidence, angle of reflection. This means that if a light ray strikes a surface with an incidence angle of, for example, 30 degrees relative to the normal, it will reflect off the surface at the same angle of 30 degrees on the other side of the normal. This behavior is predictable and forms the basis for many applications, such as periscopes, telescopes, and reflective mirrors used in various devices.