Small hole imaging problems, causes of small hole imaging What are the causes of small hole imaging

Light travels in a straight line in the same homogeneous medium.

The image of the hole size is not clear, the image of the hole is clear, and the specific size of the hole depends on the distance between the image and the hole.

1. Aperture imaging regrets early.

The reason is that light travels in a straight line.

2. 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 the phenomenon of 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.

3. Put a sharpened pencil and make a small hole in the center of a piece of cardboard. The diameter of the hole is about three millimeters. Try to put it upright on the table. Then close the curtains to dim the light in the room.

4. Light a candle on the stove 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; When the white paper slowly moves away from the small holes, it seems to slowly become larger and darker.

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

Light can only be diffracted when the size of the hole or obstacle is smaller than the wavelength of the light wave, or similar to the wavelength. Since the wavelength of visible light ranges from 4 10 to 7 m, it is rare to see obvious diffraction of light in daily life.

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 is the first time in human history that there has been a scientific explanation of the way light propagates and has been widely used later.

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 silver cover of the imaging screen is divided by the distance from the aperture to the object to form the ratio of the image to the size of 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.