Regardless of medium, whenever there's a futuristic, science-fiction war going on, there are lasers. Laser guns, laser swords, laser cannons — laser everything. Now, this isn't to say that lasers are an impossibility in the real world. In fact, the U.S. military has kept an eye on developing high-powered, laser-based weaponry since the 1960s. Even today, the U.S. military is using lasers to heat up objects, like missiles, to take them down with speed, accuracy, and ease.
But here's why the sci-fi staple, as we know it, would suck in the real world.
6. The shot itself
The problem with lasers as seen in popular films like Star Wars is that they don't obey the laws of physics. A laser gun used in combat would feel more like the pen you use to play with cats than any kind of real rifle. Applying actual science to the pop culture weaponry shines a light on how terrible they'd actually be.
There are many works of fiction that employ laser weaponry, so it's hard to pinpoint all of the problems. If you want to be precise, just know that if the blast moves at a rate slower than 299,792,458 meters per second, then it's not a laser. Since you can actually see them move in films, they're plasma — so we're going to assume this discussion is actually about plasma weaponry from here on out.
So maybe cut stormtroopers a little slack. It's not them — their weapons just suck. (Disney)