Question

Red light is always used for danger signal give reason

Answer 1

Here is your answer

When light passes through a glass prism then it disperses into seven colors. The angle of deviation of red color is minimum from its actual path that is why it is seen from far distance and preferred as a danger signal. Its wavelength is longest and frequency is less as compared to the other colors of visible spectrum. Its interaction with atmosphere is less due to low frequency.

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Answer 2

Due to scattering of life light