The experimental report of the small hole imaging, what is the conclusion of the small hole imaging

Solved the problem Collection ** to QQ space Physical convex lens imaging law experiment report How to write? (Candle convex lens light screen) Hurry up Thank you 25 [ Tags:Convex lens Light screen,Convex lens, imaging ] Question supplement 2008-10-26 15:

05 Whistleblowing.

Straight line propagation of light: Light travels in a straight line in the same homogeneous medium. Aperture imaging, shadow, and spot are the phenomenon of linear propagation of light.

The maximum velocity of light in a vacuum is 3 108 m s and 3 105 km s.

The law of reflection of light: one side, two sides, three equal sizes. [The angle between the incident ray and the normal is the angle of incidence.] The angle between the reflected ray and the normal is the reflection angle. 】

Imaging characteristics of plane mirror: virtual image, equal size, equal distance, symmetrical with the mirror surface. The reflection of an object in water is a reflection of light from a virtual image.

Refraction Phenomena and Laws of Light: Seeing the virtual image of chopsticks and fish in the water is the refraction phenomenon of light.

Convex lenses have a converging effect on light, and concave lenses have a divergent effect on light. The law of refraction of light: one side, two sides, three with the big and four empty.

Convex lens imaging rule: [U=F does not image when U=2F V=2F becomes an inverted real image]

Object distance u image distance v properties of the image optical path diagram application.

u>2f f2f reversible magnification slide projector.

u Convex lens imaging experiment: The candle, convex lens, and light screen are placed on the light fixture base in turn, so that the center of the candle flame, the center of the convex lens, and the center of the light screen are at the same height. Answers supplemented **Topic; **Features of Plane Mirror Imaging

equipment required; Candles (two), flat mirror (translucent), scale, white paper, matches, protocols; First, lay a 16-carat white paper on the tabletop, draw a straight line with a pencil on the middle line of the white paper, and stand the plane mirror vertically on this straight line

2. Light a candle on one side of the plane mirror, from this side you can see the image of the lit candle in the plane mirror, cover the back of the plane mirror with opaque paper, and find that the image still exists, indicating that the light does not pass through the plane mirror, thus proving that the image formed behind the plane mirror is not the convergence of actual rays, but a virtual image 3. Take the blackout paper and put an unlit candle behind the plane mirror, when the size and height of the candle are equal to the height of the lit candle, you can see that the unlit candle behind it also seems to be lit Explain that the size of the image behind it is equal to the size of the object

4. Use a pencil to write down the positions of the lit and unlit candles, remove the flat mirror and the candle, use a scale to measure the marks made on the white paper, and measure the distance from the lit candle to the flat mirror and the distance from the unlit candle (i.e. image) to the flat mirror Compare the magnitude of the two distances and find that they are equal

6 From this experiment we have come to the conclusion that the image of an object in a plane mirror is a virtual image, that the size of the image is equal to the size of the object, that the distance from the image to the plane mirror is equal to the distance from the object to the plane mirror, and that the line between the image and the object is perpendicular and bisected by the plane mirror

Imaging of small holesThe conclusion of the experiment is that light travels in a straight line.

Aperture imaging is formed according to the principle of linear propagation of light. 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. 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.

In the small hole imaging test, an inverted candle flame image is displayed on the imaging screen. Convex lens imaging.

In the test, the candle flame images on the imaging screen were all upside down, and there were three cases: zooming in and out, and equal in size. The camera is made using the principle of convex lens imaging, and the image is inverted and reduced.

Applications for small hole imaging

1. Cameras and camcorders.

Some cameras and camcorders make use of the principle of small hole imaging – the lens is a small hole (most are equipped with a convex lens to ensure the distance of light imaging), and the scene enters the darkroom through the small hole, like some special chemical (such as silver halide, etc.) is left on the film (digital camera).

Cameras, etc., store images on memory cards through some sensors.

inside). 2. The wave theory of light.

Wave theories of light, such as Young's interference experiment.

Double-slit experiments and other light interference.

Experiments play a key role, and the principles of aperture imaging and the methods of interferometry experiments are still very useful in modern physics.

Preparation materials tools: paper cups, white paper, needles, candles, lighters.

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.

4. Put the perforated side of the cup close to the lit candle and make a portrait on the white paper.

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

Small hole imaging - small experiments in physical chemistry science for children.

In the third week, I started the second lesson of the new class - the propagation of light, and the progress was a little slow, and I was a little worried that the new class would not be finished in the future.

The point of this lesson is that light travels in a straight line in the air. There are two experiments:

Experiment 1: One is to poke a small hole in the middle of three cardboards, these three small holes are in a straight line, if the three holes are in a straight line, the light can pass through the three cardboards, and the light hits the fourth complete cardboard, move one of them casually, the three small holes are not in a straight line, the light cannot pass through the three cardboards, and the light cannot hit the fourth cardboard.

Experiment 2: It is a small hole imaging experiment.

The experimental equipment includes: disposable paper cups, translucent plastic film, disposable rubber bands, candles, and lighters (only I can prepare them for safety reasons). The plastic film is covered on the rim of the disposable cup and fixed with a disposable rubber band.

Finally, poke a small hole with a diameter of less than three millimeters at the bottom of the cup, light the candle and point the small hole to the candle, and you can see the flame upside down and left and right on the plastic sheet.

In order to worry about the problem of betraying the second experiment student when doing it, I had to do a pre-class experiment in advance, and when I went home in the afternoon, I remembered to buy a disposable paper cup, but I forgot it, and I went downstairs after eating to buy it and try it. Hey, not to mention that the success rate is very high, I have a sense of accomplishment and magic when I see the phenomenon, and I guess they will like it tomorrow.

Preparation materials tools: paper cups, white paper, needles, candles, lighters.

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 open your eyes to make a letter.

4. Put the perforated side of the cup close to the lit candle and make a portrait on the white paper.

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

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. Moving the middle plate back and forth changes the size of the image on the wall, which illustrates the nature of the light propagation along the 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. In this way, an inverted candle flame will be seen on the white paper.

It is 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.

It is possible to pierce several holes of different sizes and shapes on the cardboard, with holes separated by a few centimeters. 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.