Which kind brother and sister helped me summarize the small hole imaging. to be detailed .

Imaging of small holes. Use a plate with a small hole to block between the screen and the object, and the inverted image of the object will be formed on the screen, which we call this phenomenon small hole imaging. Move the middle plate back and forth, and the size of the image will also change.

This phenomenon reflects the nature of light rays traveling in a straight line.

Because there is a lot of content that you can get to.

Check it out, Encyclopedia).

Imaging of small holes can be done by mapping.

Keep the hole at the same level as the center of the flame.

The outer flames are wired downwards.

The wicks are connected upwards.

projected on a light screen.

You can see ......

Then close the curtains to dim the light in the room. Light a candle and place it near the hole. Take a blank piece of paper and place it on the other side of the hole.

This way, you will see an inverted candle flame on the white paper. We call it the image of a candle. Move the white paper back and forth to see how the candle flame looks.

When the white paper is closer to the hole, it looks small and bright; As the white paper slowly moves away from the holes, it seems to slowly grow larger and darker. Changing the size of the holes, let's look at the changes in the image of the candle. You can prick several holes of different sizes and shapes on a piece of cardboard, with holes a few centimeters apart.

At this time, on the white paper, there are several inverted images corresponding to the small holes. They are all the same size, but the degree of clarity varies, and the larger the hole, the less clear the likeness. As long as the hole is small enough, its shape, whether it is square, round, or oblate, does not affect the clarity of the objectThis experiment raises at least three questions for us

Why is the statue of Xiao Kong upside down? What factors are related to the size of the image? What factors are related to the clarity of the image?

To illustrate these issues, let's think of a candle's flame as being made up of many small glowing dots, each of which shines in all directions. There will always be a small beam of light that goes straight through the small hole, creating a small spot of light on the white paper. Each luminous point on the candle flame will form a corresponding light spot on the white paper, and all the light spots on the white paper will form a candle flame image.

As can be seen from the diagram, the light from the upper part of the candle flame passes through the small hole in a straight line and shines on the lower part of the white paper; The light emitted from the lower part of the candle flame shines on the upper part of the white paper through a small hole, so that an inverted image is formed on the white paper. This just shows that the light is transmitted by the straight nuclear sock stool. If you make the hole too large, the beam through the hole will become thicker.

When the beam from each part of the candle flame passes through the larger holes, it forms some large spots of light on the white paper. These flares of light overlap with each other, and the image of the candle flame becomes blurred. If you increase the aperture of the small hole, there will only be a large blurry spot on the white paper.

About 2,450 years ago, a Chinese scholar, Mo Zhai and his students, conducted the world's first experiment on the formation of inverted images of small holes, explained the reasons for the formation of inverted images of small holes, and pointed out the nature of the linear progression of light. This is the first scientific explanation of the linear propagation of light. Looking forward to satisfaction, Mid-Autumn Festival

The small hole is imaged as a real image.

The image is the same as the size of the object, the image is upside down and upside down, the smaller the hole, the clearer the image, but the brightness will be smaller. Aperture imaging is characterized by the linear propagation of light, and various colors of light can be imaged after passing through the aperture. Aperture imaging features If the object is colored, the image is also colored, and the image is exactly the same color as the object.

Small hole imaging properties application

1. Some cameras and camcorders use the principle of small hole imaging - the lens is a small hole (most of them are installed with a convex lens to ensure the light imaging distance), and the scene enters the dark room through the small hole, and is left on the film by some special chemicals (such as silver halide, etc.) (digital cameras, camcorders, etc. store the image in the memory card through some image sensors).

2. The wave theory of light, such as Young's interference experiment, double-slit experiment and other light interference experiments play a key role, and the principle of small hole imaging and the method of interference experiment are still very useful in modern physics.

3. The linear propagation nature of light has been widely used in the ancient astronomical calendar of China. Our ancestors made the Gui watch and the sun and heat, and measured the length and direction of the sun's shadow to determine the time, the winter solstice, and the summer solstice; A speculum is attached to an astronomical instrument to observe celestial phenomena and measure the position of stars.

4. In addition, China has long used this property of light to invent shadow puppetry. At the beginning of the Han Dynasty, Qi Shaoweng used paper-cut people and objects to perform behind the white screen, and illuminated with light, the images of people and objects were reflected on the white screen, and people outside the screen could see the performance of the images. Shadow puppetry was very popular in the Song Dynasty, and later spread to the West, causing a sensation.

In fact, as early as about 2,450 years ago, the famous scholar Mo Zhai, also known as Mozi, and his students did the first experiment in the history of the world to form an inverted image, and the results of this experiment not only explained the reason why the small hole was imaged into an inverted image, but also pointed out the nature of light propagating along a straight line. This was the first time in human history that there was a scientific explanation of how light propagated, and it was later widely used.

The experimental process of small hole imaging is: first prepare a plate with small holes, and then place it between the wall and the object, and then through the light contrast, we can observe the reflection of the object on the wall, and people call such a phenomenon small hole imaging. If we move the slab back and forth, we can see that the size of the image on the wall changes accordingly, which illustrates the nature of light propagating in a straight line.

The principle of aperture imaging is that light will propagate in a straight line in the same uniform medium without interference from gravity, which is the straight propagation of light.

Aperture imaging has been developed from ancient times to the present, and the principles discovered by our ancestors have been studied and improved in various ways, thus further improving the characteristics of contemporary aperture imaging. In fact, the characteristics of aperture imaging are: the image formed by aperture imaging is a real image, not a virtual image; Secondly, the distance from the position of the aperture to the position of the imaging screen is divided by the distance from the aperture to the object to form the ratio of the size of the image to the object. Then, the resulting real image is proportional to the size of the object; Finally, the hole is imaged as an inverted and upside-down image.

To sum up, the formed image is an image that is symmetrical to the center of the original object, a real image, not a virtual image.

Aperture imaging, a natural phenomenon, is blocked between the wall and the object with a plate with a small hole, and an inverted image of the object will be formed on the wall. When the middle plate is moved back and forth, the size of the image on the wall also changes, which illustrates the nature of light propagation in a straight line.

About 2,450 years ago, a scholar in China, Mo Zhai (Mozi) and his students, conducted the world's first experiment of forming an inverted image of a small hole. In the "Book of Ink", the image of the small hole is recorded in this way: "The scene arrives, there is an end at noon, and the scene is long."

Say it on the end. ""Scenery. The man of light is as bright as he shines, and the man below is also high; The one who is higher also goes down.

The foot shades the light, so the scene is on the top; The first cover is glazed, so the scenery is below. There is an end in the near and far, and Yu Guang, so the scenery is also in the library. ”