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Retroreflector

Device to reflect radiation back to its source / From Wikipedia, the free encyclopedia

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A retroreflector (sometimes called a retroflector or cataphote) is a device or surface that reflects radiation (usually light) back to its source with minimum scattering. This works at a wide range of angle of incidence, unlike a planar mirror, which does this only if the mirror is exactly perpendicular to the wave front, having a zero angle of incidence. Being directed, the retroflector's reflection is brighter than that of a diffuse reflector. Corner reflectors and cat's eye reflectors are the most used kinds.

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Retroreflector
A gold corner cube retroreflector
UsesDistance measurement
by optical delay line
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