Question

You might have observed that ‘danger’ signal lights are red in colour. Do you know why?

Answer 1

the red light is least scattered by the particles of smoke and fog due to its longer wavelength.therefore, red light can be seen distinctly at a distance.

Answer 2

The red is least scattered by fog or smoke. Therefore, it can be seen in the same colour at a distance. Hence we will be aware of the danger even in such consequences.