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The Reflection of Infra-red Radiation from a Surface.
When infra-red radiation falls on an
object,
some will be reflected and some will be absorbed.
The greater the proportion of radiation that is reflected,
the less will be absorbed.
An object with a matt or dark
surface
will be a poor reflector of
infra-red radiation.
An object with a shiny or light
surface
will be a good reflector of infra-red
radiation.
Shiny metal
foil can be placed behind a
radiator
in a
room to increase its efficiency.
The foil reflects radiation
back into the room which
heats the air rather than heating the wall.
This adds to the efficiency of convection in the room.
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