Question

Vehicles moving in foggy weather use yellow - colour head light. Why?

Answer 1

because in foggy weather we can't see anything but we can see headlight if there is no headlight then there will be accident

Answer 2

The reason behind this is that,

yellow has the highest wavelength and which is less scattered by fog and so, with this light visibility will increase for the drivers. That's why, we use yellow colour light for fog in Vehicles.