What is the result of the imaging of the small hole

The reason for the imaging of small holes is that light travels in a straight line.

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.

Take 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.

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, whether it is square, round, or oblate, the clarity of the object and the shape of the image do not matter.

Aperture imaging, a Chinese scholar Mo Zhai (Mozi) and his students, did the world's first experiment of small hole inverted image, explained the reason for small hole inverted image, pointed out the nature of light along a straight line, and summarized a similar theory more than 2000 years earlier than Newton. This is the first scientific explanation of the propagation of light along a straight line.

If a plate with a small hole is used to block between the wall and the object, the reflection of the object will be formed on the wall, and we call this phenomenon the image of the hole. 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.

Aperture imaging is imaging based on the principle that light travels in a straight line.

I used to make a model when I was in school.

It is quite certain that the image and the object are upside down and upside down. The light emitted from the top of the object hits the underside of the phosphor screen through a small hole.

Because what you see in the small hole image is a real image that is made up of actual light converging.

The characteristics are:1It looks like a real image.

2.The ratio of the image to the size of the object is (the distance from the hole to the imaging screen) divided by (the distance from the hole to the object).

3.The resulting image is the same as the size of the object.

4.It looks like it is upside down and upside down (symmetrical to the center of the original object)5The smaller the hole, the clearer the image, but the brightness will be smaller.

The real image can be displayed on a piece of paper.

And upside down, side down.

You draw a picture and it's clear.

The principle of aperture imaging is that light travels along a straight line, and the aperture can be used to form an image of the light source on the screen, which is like an inverted and reduced real image. Therefore, the shape of the light source and the shape of the image have nothing to do with the shape of the hole.

Notice the difference between the two images below:

Note that the principle of aperture imaging is independent of the diffraction of light.

Hole imaging has nothing to do with the shape of the hole, and the size of the image is related to the distance from the object to the hole and the distance from the screen to the hole.

If the distance from the hole to the screen is unchanged, the farther the object is from the hole, the smaller the image, and the closer the object is from the hole, the larger the image. If the distance between the object and the hole remains the same, the greater the distance between the hole and the screen, the larger the image, and vice versa.

For example, the light spots in the trees are circular, not the shape of the gaps in the leaves.

Light travels in a straight line in the same homogeneous substance. The closer the object is, the larger the image and the darker the brightness; The farther away the object is, the smaller and brighter the image.

It doesn't matter, the principle of small hole imaging is to use the straight line propagation of light, so the image is inverted, and the light is fluctuating, so the image has nothing to do with the shape of the hole.

Junior high school generally thinks that it doesn't matter

The small hole into a shed finger image is formed (c).

a.Just like bNegative image cInverted like DHologram.

Extension of the basic definition of small hole imaging:

Aperture imaging is a natural phenomenon, with a plate with a small hole to block between the wall and the object and respect, the wall will form an inverted real image of the object, we call such a phenomenon aperture imaging. When the middle slab is moved back and forth, the size of the image on the wall also changes, which illustrates the cautious nature of light propagation in a straight line.

Aperture imaging, a scholar in China, Mo Zhai and his students, did the world's first experiment of inverted image of aperture, explaining the phenomenon of inverted image of aperture, which illustrates the propagation of light along a straight line.

Extension of experimental conclusions for small-hole imaging:

Light travels in a straight line in the same homogeneous substance. When the image distance is constant, the closer the object distance, the larger the image and the brighter it becomes. The farther away the object is, the smaller the image becomes and the brighter it dimens. When the object distance remains the same, the screen near image becomes smaller and brighter; The screen teleimage becomes larger and darker.

When the position of the object, hole and screen remains unchanged, imaging is the premise, and the image becomes brighter when the hole is relatively large.

Extension of the principle of small hole imaging:

The principle of aperture imaging is that light travels in a straight line in the same homogeneous medium without being disturbed by gravity. The smaller the hole image, the clearer the image, but the brighter it will be. The image of the small hole is inverted and magnified.