Web retroreflection occurs when a light beam returns in a path parallel from which it came, as demonstrated in figure 1. 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. Beyond road use, retroreflection is used in.
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Refractive index
Of or relating to a surface, material, or device (retroreflector ) that reflects light or other radiation back to its source;
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.
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