Why are the danger signals red in color?

In this article you will get to know the reason behind red color of danger signals.

Created On: May 19, 2015 11:17 IST
Modified On: Jul 8, 2015 12:00 IST

Q. Why are the danger signals red in color?

Ans. When the light passes through atmosphere, it gets scattered by small air particles. The scattering of light is inversely proportional to the fourth power of its wavelength. As the red light has the highest wavelength among all the colours, so it is scattered the least. Due to which most of the light gets reflected back and can travel longer distances through rain, fog, dust etc. to reach our eyes effectively.

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