Small aperture imaging

Scientific Enlightenment:

   Small hole imaging, about 2,400 to 2,500 years ago, scholars in our country --Mozi and his students conducted the world's first experiment to demonstrate the inversion of images through a small aperture, explaining the cause of the inversion and pointing out the property of light traveling in straight lines. This was the first scientific explanation of the straight-line propagation of light.By blocking a plate with a small hole between a wall and an object, a reflection of the object will form on the wall. We call this phenomenon small hole imaging. When the plate in the middle is moved forward or backward, the size of the image on the wall will also change. This phenomenon illustrates the property of light traveling in straight lines.

Science Project:

1Recognize and prepare the necessary materials for the experiment.

2Install in sequence according to the instructions.

Three,Installation completed and debugging is underway.

Scientific Principles:

Light travels in straight lines through homogeneous matter.

The closer the object is, the larger the image becomes and the darker it is; the farther the object is, the smaller the image becomes and the brighter it is.

Science Expansion:

The principle of the straight line propagation of light and the formation of images through a small hole:Light travels in straight lines through homogeneous media, unaffected by the force of gravity. The sun provides humans with light and heat, which is an indispensable source for humans. However, due to the Earth's rotation, day and night are formed. Every night, darkness covers the earth. The ancestors of humans in ancient times were powerless against the night. Darkness gave people a feeling of terror and evil, and until today, darkness is still used to describe evil. It is not known how many centuries have passed before humans discovered that fire can also provide light and heat. Initially, they used natural fire, and later invented artificial fire by friction. The invention of artificial fire by friction is a revolutionary progress in human history, "for the first time, it made people master a natural force, thereby ultimately separating humans from the animal kingdom." The Beijing Homo erectus who lived 500,000 years ago knew how to use natural fire, and about 10,000 years ago, humans learned to use the drill wood method to create artificial fire. For a long time, fire has been a "useful" that people can use.Artificial light sources were later created, such as oil lamps and candles, but people still relied on fire. It wasn't until the invention of modern light sources that fire was replaced. Through long-term observation of light, people have discovered that the light that reaches the ground through the gaps in the leaves of dense forests forms.Ray-like beams of light, the sunlight entering the room through the small window is also like this. A large number of observation facts have led people to realize that light propagates along straight lines. In order to prove this property of light, about 2,450 to 2,500 years ago, our outstanding scientists in ChinaMozi and his students conducted the world's first experiment to form an inverted image through a small hole, explaining the principle of the formation of an inverted image through a small hole. Although he was not talking about imaging but forming shadows, the principle is the same.