How Do Retroreflectors Give You Super Night Vision?


A couple of notes: In the diagram, I’m just drawing a person with a flashlight instead of a car with headlights. (I’m sure we’ll all agree that it’s the same thing, right?) For the dry road, I drew a few random rays of light, not all of which are different ways that light can come out. The important thing is that one of these rays returns to the person so that the path can be seen by them. However, note that the total amount of displayed light cannot be more than the event light, or the running light. towards something. I tried to show this by drawing lighter colored reflected rays. That is, the light reflected back to the viewer is always dimmer than much of the light originally emitted from the source.

For wet roads, all lighting is mirrored farther from the flashlight. If you’re in a car heading from the other side of the road, this light is very bright. That’s why other cars on the road can make it twice as hard to see if you’re driving in the rain.

Retroreflectors

Retroreflectors are not only used not only on lane markers, but also traffic signs and safety gear on bicycles, to make them more visible to drivers.

A retroreflector will not reflect light on all the directions are like a dry road, and it doesn’t show the light farther from the source like a flat mirror. However, a retroreflector will direct the light back to the source. Yes, if you turn on the mirror light with 0 & deg; angle of occurrence – right of the mirror – it will return directly to the source. But with a retroreflector, the light returns to its source any way it came from.

As you drive, your eyes are looking at a plane not too far from the one with the lights on. That means the light will explode from the headlight to the lane marker and return to the level of your eyes, and you’ll see these mirrors as bright – and that’s good, because it helps you stay on track.

But if you’re on the side of the road and a car passes by, you won’t see the lane signs as brightly. None of the light from the car’s headlights will show up on the side and into your eyes.

Here are two images of the roads. The main image has lines painted and the bottom has lines with retroreflectors. Did you notice the difference?

Photo: Rhett Allain

How to make a Retroreflector

There are different designs for retroreflectors, but I will show you the two simplest ways to use one. This first method uses three flat mirrors (they can be as big or small as you like) connected at right angles. Together, these mirrors form the corner of a box. If a light ray enters this retroreflector, it will create multiple mirrors, surround the mirrors and later come out of its way as well.

Here’s what it looks like to use red and green lasers. I placed the two lasers at different angles so you can see that each beam of light returns the same way it enters.



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