Why can the camera capture ghosts that we can't see with the naked eye? Is there really a ghost in this world?

Ordinary cameras can't shoot things that we can't see with the naked eye. Most of the so-called ghost films you see on the Internet are post-PS. A few images are formed by adding special filters (such as infrared filters and ultraviolet filters), special lenses (such as catadioptric lenses) or after long exposure, which is also called "ghost" in the professional name of photography, and some are superimposed and synthesized in the later stage.

It has been said that the camera's light sensitive range is wider than people's eyes, so it can see infrared and ultraviolet waves that people can't see, so as to prove the real existence of ghosts. But I'm sorry to tell you that at present, the scientific community has not photographed the so-called ghost through any equipment that records infrared and ultraviolet waves. All you can see are ordinary cameras, so the reason is self-evident.

As for whether there are ghosts in the world, it will be a subject of quantum mechanics to study the relationship between human consciousness and the universe. This is not something you can worry about proving.