why red light is used for signal purposes??
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The primary reason why the color red is used for danger signals is that red light is scattered the least by air molecules. The effect of scattering is inversely related to the fourth power of the wavelength of a color. ... So red light is able to travel the longest distance through fog, rain, and the alike.
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Because it has minimum deviation and is qlso visible from a very far distance.
This helps the drivers to stop their car from a far away distance.
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