Retroreflector

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A retroreflector is a device or surface that reflects light back to its source with a minimum scattering of light. An electromagnetic wave front is reflected back along a vector that is parallel to but opposite in direction from the wave''s source. The device or surface''s angle of incidence is greater than zero. This is unlike a planar mirror, which does so only if the mirror is exactly perpendicular to the wave front, having a zero angle of incidence.

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High Quality Content by WIKIPEDIA articles! A retroreflector is a device or surface that reflects light back to its source with a minimum scattering of light. An electromagnetic wave front is reflected back along a vector that is parallel to but opposite in direction from the wave's source. The device or surface's angle of incidence is greater than zero. This is unlike a planar mirror, which does so only if the mirror is exactly perpendicular to the wave front, having a zero angle of incidence.