How do scientists understand ghosts?

Ghost "sounds terrible, and the" ghost "we usually say is also terrible. But what is a "ghost"? We don't know. See how scientists understand ghosts.

This Yuanling fog is the most common kind of ghost. In fact, Yuanling is formed by the condensation of water vapor exhaled by the photographer and the reflection of the flash lamp. Photographers who catch ghosts in the cold front yard of the church will pay special attention to this effect. Also, in order to prevent the influence of fog, smoking is forbidden when shooting.

People may ignore the flash when taking pictures, but the digital photo information stored in EXIF format clearly records the whole process of shooting.

Another common phenomenon is image distortion. People often think that irregular transparent objects in space will distort light. GordonRutter, author of Ghostbusters 3, said that hanging the camera belt in front of the camera lens would have a similar effect.

When the flash is turned on, the strong light makes the dust visible and reflects back to the camera. Because the dust is out of focus, it will be blurred, so the photos look like big white spots, and some are hexagonal (related to the shape of the camera aperture).

The so-called "ghost" will appear in the photos taken by the glass flash. As early as 1862, john henry Payper of the Royal Institute of Technology in London and Henry Derricks, an engineer, applied the ghost imaging principle to the ghost effect in Dickens' haunted play.

Mysterious light spots often appear in places with heavy yin, such as ancient caves, cemeteries and old houses. But in fact, the so-called light spot should be caused by dust or other particles in the air that are very close to the lens and the light is very dim, which cannot be observed by the naked eye.

Its principle is to project the virtual image of the actor into the scene by specular reflection. Later, this technology was named "Pepper's Ghost" after the inventor, Payper ghost.

The brain is usually very sensitive to faces, which is why people have a particularly strong ability to recognize faces with random shapes. This is very similar to the spread of ghost stories. After some polishing, ordinary things become people's subjective "ghosts".