How to do small hole imaging, small hole imaging production method

Aperture imaging, Chinese scholar Mo Zhai (Mozi) and his students, did the world's first experiment of small hole inverted image, explained the reason for the 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.

Take a sharpened pencil and make a small hole in the center of a piece of cardboard.

The small hole is about three millimeters in diameter and manages to hold it upright on the table, and then the curtains are closed 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 candle, it is small and bright; As the white paper slowly moves away from the candle, 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, has no effect on the clarity of the image and the shape of the image.

The method of making small hole imaging is as follows:

Method 1: 1Put candles, perforated screens, and grounded glass screens.

Light the candle and adjust the height of the candle and the screen so that the center of the candle's flame, holes, and ground glass screen are roughly in a straight line. The distance between the candle and the small hole screen should not be too large. After the adjustment, you can see the actual image of the candle flame upside down on the frosted glass screen.

2.By moving the position of the candle or frosted glass screen, you can see that the closer the candle is to the hole or the farther away from the ground glass screen is from the hole, the larger the image will be.

The method of making small hole imaging is as follows:Material preparation: paper cups, translucent plastic film, rubber bands, candles, etc.

1. Gently cover the plastic film on the mouth of the paper cup, and tie it firmly with a rubber band, pay attention not to pull too hard in this step to prevent the plastic film from being torn.

2. Gently pull and tidy up to keep the plastic film flat.

3. Use a toothpick to prick a small hole in the bottom of the disposable paper cup.

4. Put the candle in a tray and light the prepared candle, and pay attention to safety when lighting it.

4. Point the hole at the bottom of the paper cup against the lit candle.

5. Adjust the distance between the paper cup and the candle to keep the same straight line.

6. If you look at the screen of the paper cup and bottle, you can see a clear image.

Steps:1. Use scissors to cut off one end of the opening of the can.

3. Use an awl to make a small hole in the bottom of the can.

4. Tie a small hole (diameter less than mm).

5. Roll it into a paper tube with hard cardboard just enough to insert it into the can.

6. Fix with transparent glue.

7. Finished paper tubes.

8. Seal the cooking paper with a rubber band at one end of the paper tube.

9. Put the paper tube in the cut can.

10. Aim the small hole at the bright scene, and you can see the upside-down image on the screen (cooking paper).

Experiment Description: <>

Since the light travels in a straight line, the light from above the scene hits the bottom of the screen through the hole, and the light from below comes to the top of the screen through the hole, so we see an upside-down image on the screen.

Safety measures: 1. This experiment uses scissors and a cone to be carried out under the guidance of an adult.

2. The cut edge of the can is very sharp, so be careful, it is best to stick a circle of transparent rubber strip on the cut mouth of the can.

Make small hole imaging with a paper cup:

1. Prepare a paper cup and cover the opening side with white paper.

2. Poke a small hole with a needle at the bottom of the paper cup.

3. Light a candle and finish serving.

4. Put the hole in the cup close to the burning candle and the image on the white paper.

5. Put the perforated side of the cup a little closer to the candle, and the candle will become larger.

Conclusion: Light propagates 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.