Reflector
Reflector (-ẽr) , noun
[Compare French réflecteur.]
1.
One who, or that which, reflects. — Boyle
2.
(a) (Physics) Something having a polished surface for reflecting light or heat, as a mirror, a speculum, etc.
(b)
(Physics) A reflecting telescope.
(c)
(Physics) A device for reflecting sound.