彩虹树
(原标题: Rainbow Tree)
2023-03-13
浏览次数: 15
彩虹的尽头是什么？对每个人来说都是不同的。例如，对于拍摄这张照片的摄影师来说，彩虹的一端终止于一棵树。然而，附近的其他人可能会看到彩虹在其他地方结束。这是因为彩虹的位置取决于观察者。彩虹的中心总是出现在与太阳相反的方向，但在不同的位置，这个方向在地平线上的排列是不同的。这道彩虹的弧线表明，它的中心在左边约40度，略低于地平线，而太阳在相机后面，刚好在地平线之上。在远处的暴风雨中，雨滴在彩虹方向上反射和折射阳光，这就是产生彩色光带的原因。这张单次曝光的照片摄于1月初美国加利福尼亚州的奈特渡口附近。
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What lies at the end of a rainbow? Something different for everyone. For the photographer taking this picture, for example, one end of the rainbow ended at a tree. Others nearby, though, would likely see the rainbow end somewhere else. The reason is because a rainbow's position depends on the observer. The center of a rainbow always appears in the direction opposite the Sun, but that direction lines up differently on the horizon from different locations. This rainbow's arc indicates that its center is about 40 degrees to the left and slightly below the horizon, while the Sun is well behind the camera and just above the horizon. Reflections and refractions of sunlight from raindrops in a distant storm in the direction of the rainbow are what causes the colorful bands of light. This single exposure image was captured in early January near Knight's Ferry, California, USA.
© Eric Houck