Light Sky Under Rainbow
彩虹下的天空
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照片由Dubby Waggoner拍摄，经许可使用。
Rainbow concepts
Atmospheric optics concepts
References
Greenler
Schaaf
索引 雨虹概念 大气光学概念 参考文献 Greenler Schaaf
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HyperPhysics ***** 光与视觉 | R Nave |
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Light Sky Under Rainbow彩虹下的天空
照片由Dubby Waggoner拍摄，经许可使用。 |
Index Rainbow concepts Atmospheric optics concepts References Greenler Schaaf 索引 雨虹概念 大气光学概念 参考文献 Greenler Schaaf | |||||||
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Dark Sky Between Rainbows彩虹之间的黑暗天空
 The light rays which form the primary rainbow are the rays of that color which strike the eye from the highest angle, all other rays of that color emerging at an angle closer to the horizontal. Those additional rays contribute to the light sky under the rainbow, but that light is essentially achromatic since some rays of all colors emerge at those angles. On the other hand, the rays which form the secondary rainbow are the rays of that color which strike the eye from the lowest angle. This means that for falling droplets between the lowest angle of the secondary rainbow and the highest angle of the primary rainbow, there are no internally reflected rays which reach the observer's eye. 形成主虹的光线是那些从最高角度射入眼睛的光线，其他同色光线则以更接近水平的角度出现。这些额外的光线对彩虹下的天空有贡献，但这种光本质上是无色的，因为所有颜色的光线都在这些角度中出现。另一方面，形成次虹的光线是那些从最低角度射入眼睛的光线。这意味着对于位于次虹最低角度和主虹最高角度之间的雨滴，没有内部反射的光线能到达观察者的眼睛。
According to Lynch and Livingston, this dark band is called "Alexander's dark band", named after the Greek sage Alexander of Aphrodisias. Alexander described this band in his chronicles in about 200 AD. 据Lynch和Livingston所述，这个暗带被称为‘亚历山大的暗带’，以希腊哲人亚历山大一世（阿波罗尼亚人）命名。亚历山大在约公元200年撰写的编年史中描述了这个带。
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Index Rainbow concepts Atmospheric optics concepts References Greenler Schaaf Lynch and Livingston Sec 4.7 索引 雨虹概念 大气光学概念 参考文献 Greenler Schaaf Lynch 和 Livingston 第4.7节 | ||||||
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