Final answer:
The angle of the Earth's axis relative to the perpendicular direction of its orbital plane is 23.5°, and the law of reflection states the angle of incidence equals the angle of reflection, measuring both angles from the perpendicular to the surface.
Step-by-step explanation:
The question involves the angle made by the Earth's axis relative to the direction perpendicular to the plane of Earth's orbit, and the concept of angular momentum as related to rotational physics. The Earth's axis makes a constant angle of 23.5° with the direction perpendicular to its orbital plane. In physics, the angle of a vector like angular momentum relative to a surface or reference direction is important for understanding the vector's components and the physical outcomes of its interactions. When discussing reflections, the law of reflection states that the angle of incidence is equal to the angle of reflection, both measured relative to a line perpendicular to the reflective surface.