Wed. Oct 27th, 2021


A few notes: In the diagram, I drew a man with a flashlight instead of a car with headlights. (I’m sure we can all agree that it’s basically the same thing, isn’t it?) For dry roads, I drew a few random rays of light, not all different ways that light can bounce. The important thing is that one of these rays goes back to the person so that the road is visible to them. However, note that the total amount of reflected light cannot be greater than that of incident light, or light going Towards An object I have tried to show by drawing a reflected ray of light color. In other words, the light reflected to the viewer is always dimmer than the amount of light emitted from the source.

For wet roads, all light is reflected Away From the flashlight. If you were in a car coming from the other side of the road, this light would be bright. This is why it can be twice as difficult to see other cars on the road when you are driving in the rain.

Retroreflectors

Retro-reflectors are used not only for lane markers, but also for traffic signs and safety gear for bikes, to make them more visible to drivers.

A retroreflector does not reflect light All Directions like a dry road, and it does not reflect light Away Like a flat mirror from the source. Instead, a retrograde reflector returns the light to the source. Yes, if you light a mirror with 0 & deg; The angle of the event – the mirror on the right – will return it directly to the source. But with a retroreflector, whatever comes back from the light source it comes in no way.

When you are driving, your eyes are on a plane that is not above the headlights. That means lane markers from headlights and light bounce at your eye level, and you see these reflectors as bright – and that’s good, because it helps you stay on the road.

But if you are on the side of the road and a car passes by, you will not see the lane markers bright. No light from the car’s headlights will be reflected to the side and to your eyes.

Here are two pictures of the street. The picture above has lines drawn and the bottom has retroflectors. Can you notice the difference?

Photo: Rate Aline

How to make a Retroreflector

There are different designs for retroreflectors, but I’m going to show you two easy ways to work. This first method uses three plane mirrors (they can be as big or small as you like) connected at right angles. Together, these mirrors form the corners of a box. When a ray of light enters this retro-reflector, it will create multiple reflections, jump into the mirror and finally return to where it went.

Here’s what it looks like using a red and green laser. I placed the two lasers at different angles so that you could see that each ray of light entered in the same way.



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