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A reflector. To concentrate the heat energy into the room instead of behind it.
One who, or that which, reflects., Something having a polished surface for reflecting light or heat, as a mirror, a speculum, etc., A reflecting telescope., A device for reflecting sound.
A flat plane mirror produces regular reflections since its polished reflective surface is flat compared to the wavelength of light. If the surface is rough or irregular compared to the wavelength, the light will be scattered, resulting in diffuse reflection.
which is a better reflector of light-a black surface or a white surface
The best reflector for sound will be massive, rigid, and with a smooth surface.
room heaters have polished surface
The amount of light a material reflects depends upon the kind of material in the reflector, the extent to which it is polished , and the angle at which the light strikes the surface. your welcome.
mirror
A mirror.
A convex reflector.
diffuse is brighter than regular
because the rough surface is wet and a road is not :)