What is collimated?

"Collimated" means light rays are all going in the same direction, like a straight line.

Imagine you're playing with a flashlight. If you shine it on the wall, the light spreads out, that’s not collimated. But if you have a special kind of light, like from a laser pointer, the beam stays tight and goes straight, that's collimated.

Think about a line of kids walking in a parade. If they all walk in the same direction and keep their steps together, that’s like collimated light, everything is lined up neatly. But if some kids wander off or turn corners, that’s like non-collimated light, it scatters around.

Collimated light is super useful! For example, in a laser pointer, the light stays focused so you can see it clearly from far away. Without collimation, the light would get dim and fuzzy.

So next time you use a flashlight or see a laser, remember: collimated light means all the rays are marching in step, like a well-trained parade!