Back Llum col·limada Catalan Kollimation German Collimated beam English Luz colimada Spanish Lumière collimatée French Feixe colimado Galician קרני אור מקבילות HE समान्तरीय किरणपुंज Hindi Luce collimata Italian Kollimatioun LB
Collimated light is light whose rays are parallel. This light spreads slowly as it travels. The word collimated is related to collinear, because all the rays in collimated light line up with each other.
Perfectly collimated light would not spread out with distance at all. No real light is perfectly collimated. Real light will spread a little as it travels. Diffraction prevents anyone from creating a perfectly collimated beam.
Light can be roughly collimated by using a collimator – a device which narrows a beam of particles or waves.