The foil reflects (more or less) coherently, that is, the light rays bouncing off obey the Law of Reflection, because the foil is so smooth: Law of Reflection: The angle of reflection equals the angle of Incidence Now turn off the lights, and use the flashlight and mirror to demonstrate the Law of Reflection by reflecting the light to make a spot on the ceiling.
(the light rays; bouncing; ) (the foil; is; so smooth) (The angle of reflection; equals; the angle of Incidence)
the light rays the foil The angle of reflection
bouncing is equals
so smooth
the angle of Incidence