Retroreflector

（重定向自Retroflector）

Comparison of the effect of corner (1) and spherical (2) retroreflectors on three light rays. Reflective surfaces are drawn in dark blue.

Eyeshine from retroreflectors of the transparent sphere type is clearly visible in this cat's eyes

A retroreflector (sometimes called a retroflector or cataphote) is a device or surface that reflects light back to its source with a minimum of scattering. In a retroreflector an electromagnetic wavefront is reflected back along a vector that is parallel to but opposite in direction from the wave's source. The angle of incidence at which the device or surface reflects light in this way is greater than zero, unlike a planar mirror, which does this only if the mirror is exactly perpendicular to the wave front, having a zero angle of incidence.

单词	Retroflector
释义	Retroflector 原声例句冷知识百科大全 For example, they left four retroflectors, which are essentially fancy expensive mirrors, so they could measure how far the moon is from earth by timing how long it takes for 例如，他们留下了四个后向反射器，它们本质上是昂贵的镜子，因此他们可以通过计算月球离地球的距离来计算月球离地球的距离。英语百科 Retroreflector （重定向自Retroflector） A retroreflector (sometimes called a retroflector or cataphote) is a device or surface that reflects light back to its source with a minimum of scattering. In a retroreflector an electromagnetic wavefront is reflected back along a vector that is parallel to but opposite in direction from the wave's source. The angle of incidence at which the device or surface reflects light in this way is greater than zero, 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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