Rainbow in Waterfall
水帘中的彩虹
The same kind of light paths that create a rainbow in the sky can produce a rainbow in the spray of a waterfall. If you are looking at the rainbow in the waterfall, the sun must be behind you. The rainbow shown is a primary rainbow and is formed as a circular arc around the anti-solar point and at an anglar range of about 40° to 42°. This rainbow is in the Athabasca Falls of Alberta, Canada.
同样的光路会产生天空中的彩虹，也能在瀑布的水雾中形成彩虹。如果你在观察瀑布中的彩虹，太阳必须在你背后。所示的彩虹是第一种彩虹，它围绕反太阳点形成一个圆弧，并在约40°到42°的角度范围内出现。这张照片拍摄于加拿大阿尔伯塔省的阿萨巴斯卡瀑布。
Atmospheric optics concepts
索引：大气光学概念
| HyperPhysics***** Light and Vision
HyperPhysics ***** 光与视觉 | R Nave |
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