Lasers> Lasers remind me of football. Really! A football game ends. And fans scatter out every exit, in all directions. They’re like regular light - light that radiates (fans out) in all directions.
The marching band is different. It marches down the field and out one exit. The marchers all wear the same color uniform. They’re all about the same size. They all march to the same beat in neat, orderly rows. They’re more like a uniform light in a “laser beam!”
Laser beams are bunches of light rays that are all the same: the same size, same color, same heading. Because the rays are so alike, they can’t help but “march exactly in step” with each other. Together, they travel in a single direction. By traveling in one direction, they focus all of their energy on a single point, straight ahead. Focused <#5376,19><!energy> has a stronger impact than energy scattered all over. That’s why laser beams sometimes damage objects in their path.
