What is the sign of the rear fog light switch?
Automobile fog lamps are installed at the front and rear of the automobile, which are used for lighting and road safety warning when driving in rainy and foggy days. Improve the visibility of drivers and surrounding traffic participants. The front fog lights are usually bright yellow and the rear fog lights are red.
The signs of the rear fog lights are a little different from those of the front fog lights. The light of the front fog light sign is downward, and the light of the rear fog light is parallel, which is generally located on the dashboard in the car. Because the anti-fog lamp has high brightness and strong penetration, it will not produce diffuse reflection due to fogging, so the correct use can effectively prevent accidents. In foggy days, front and rear fog lamps are usually used together.
Fog lamp principle
When used in low visibility conditions, fog lamps must have sufficient penetration. Before talking about the principle of fog lamps, we should first understand that air is an aerosol filled with "impurities" such as tiny water droplets and suspended particles, and the light emitted by headlights must pass through these impurities to reach the ground. Since it is an aerosol, the light of a car lamp passing through it will inevitably produce a "Tindal effect", that is, when parallel light passes through the air, it will diffract a bright light beam.
The principle of Tindal effect is that the wavelengths of visible light in some wave bands coincide with aerosol particles, resulting in diffraction, which prevents parallel light from passing straight. Therefore, the best way to weaken the Tindal effect is to keep the light source away from these bands as much as possible. The light of fog lamps is divergent rather than parallel, and will not converge like headlights. If the light does not converge, the Tindal effect will not be amplified.
Simply put, fog lights have two advantages after special design: first, strong penetration and high recognition; Second, there is almost no Tindal effect, and the light will not hit the fog to block the line of sight, but also illuminate the nearby ground. This is the key to distinguish fog lamps from other lamps.