What is the principle of small hole imaging?

Principle: Light propagates in a straight line without being disturbed by gravity in the same homogeneous medium, that is, the straight line propagation of light.

Small hole imaging. About 2,450 years ago, Chinese scholar Mo Zhai (Mozi) and his students conducted the world’s first experiment in which a small hole formed an inverted image. It explains the reason why the small hole forms an inverted image and points out the nature of light traveling in a straight line. This was the first scientific explanation of the linear propagation of light.

Use a plate with a small hole to block the space between the wall and the object, and the reflection of the object will be formed on the wall. We call this phenomenon called hole imaging. By moving the middle plate back and forth, the size of the image on the wall will also change. This phenomenon illustrates the nature of light propagating in a straight line.

Extended information:

Application of the principle of pinhole imaging:

Some current cameras and video cameras use the principle of pinhole imaging - the lens is a small holes (mostly equipped with convex lenses to ensure the imaging distance of light), the scene enters the darkroom through the small hole, and the image is left on the film by some special chemicals (such as developer, etc.) (digital cameras, video cameras, etc. use some photosensitive components are stored in the memory card).