What is the Tinta effect?

Tindal phenomenon refers to the phenomenon that when a beam of light passes through the colloid, a bright path can be observed in the colloid from the direction perpendicular to the incident light. When a beam of light passes through the colloid, a bright "path" can be observed in the colloid from the direction perpendicular to the incident light, and the appearance of Tindal effect also means that light can be seen. Photography circle, also known as "Jesus light", usually appears in the early morning, at sunset or after rain when there are more clouds and fog or dust in the atmosphere. The sun shines right on it, divided into strips, and sometimes it becomes a large piece, which is particularly spectacular.

In 1869, Dindar found that if a focused beam passes through the sol, a luminous cone can be seen from the side (that is, the direction perpendicular to the beam), which is the Tindal effect. In a darkroom, parallel beams pass through a colloid that is completely transparent to the naked eye. From the direction perpendicular to the beam, we can observe a turbid and shiny beam, in which particles are flickering, which is the so-called Tindal effect. In the early morning, in the dense forest, you can often see a bunch of light beams penetrating the branches and leaves, which is similar to this natural phenomenon and is also a Tingdahl phenomenon. This is because clouds, fog and smoke are also colloids, but the dispersant of these colloids is air, and the dispersoid is tiny dust or droplets.