https://en.wikipedia.org/wiki/Cat's_eye_(road)
Cat's eye reflectors are used on roads and places where light needs to be reflected directly back where it came from.
These only reflect light back in a
very limited amout of derections.
I looked it up, and I didn't find any reflectors that reflect back in all directions, but I did design one myself. Here it is:
|
Grey=Mirror Light blue=Glass Blue=Light |
As the light enters the glass it gets diffracted. This points it directly at the mirror, which reflects it back out the glass, which diffracts it again, and the light goes back to where it came from. If you where to look in this mirror ball, it would probably look black, because it would be reflecting your eye.