| process by which radiation is returned by a surface or a medium, without change of frequency of its monochromatic components
NOTE 1 – Part of the radiation falling on a medium is reflected at the surface of the medium (surface , reflection); another part may be scattered back from the interior of the medium (volume reflection).
NOTE 2 – The frequency is unchanged only if there is no Doppler effect due to the motion of the materials from which the radiation is returned.
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