Answer:In geometric optics, the angle of incidence is the angle between a ray incident on a surface and the line perpendicular to the surface at the point of incidence, called the normal. The ray can be formed by any wave: optical, acoustic, microwave, X-ray and so on. In the figure below, the line representing a ray makes an angle θ with the normal. The angle of incidence at which light is first totally internally reflected is known as the critical angle. The angle of reflection and angle of refraction are other angles related to beams.
Explanation:tik tok: Uh.amy07
I think it is acceleration
Visible light is the spectrum that humans can see ranging from 400-700 nm
Divide the distance traveled by the time it took:
(100 m) / (4.2 s) ≈ 23.8 m/s
