Why are ‘danger’ signal lights red in colour?
Answer:
Danger signal lights are red in colour because the red coloured light having longer wavelength is - scattered the least by fog or smoke. Therefore, it can be seen clearly from a distance.
Why are ‘danger’ signal lights red in colour?
Answer:
Danger signal lights are red in colour because the red coloured light having longer wavelength is - scattered the least by fog or smoke. Therefore, it can be seen clearly from a distance.