What can a magnifying glass do 5, what can a magnifying glass do

As a child, one day, I was working on a strange shape, which was composed of all kinds of three-dimensional figures, so small that it was impossible to detect with the naked eye. No matter how wide the eyes are, the paper is close to the tip of the nose, but it is still difficult to see. Because that's too complicated after all.

I thought: maybe it's the lack of light in the room! So I went to the balcony again, spread the paper on the platform, and looked at the sun, and when I looked again, the light was enough, but it was still difficult to see the small parts.

Suddenly, I remembered the magnifying glass in my father's study, the magnifying glass can magnify**, and you can clearly see the tiny**. So, I proudly found a magnifying glass and looked at the sunlight seriously and carefully. The effect is really good, it seems clearer, bright and bright, big and big, and it is much easier to do now.

I continued my research, gesturing with my right hand on scratch paper. I found that the straight line above follows the graph on the right.

Halfway through the study, I suddenly smelled a burning smell. I looked around nervously and thought: this is not a fire!

I ran to the kitchen again, and there was nothing out of the ordinary. But where does the burnt smell come from? I wondered.

I went back to the balcony and found that the paper was actually smoking! I saw a trace of smoke rising on the paper, faintly, a little dark. There was a hole burned in the paper, and the hole was black, and there was a bit of spark on it, and I was very strange, and I looked at the sky, and then at the paper, and thought it was a fire falling from the sky.

I don't care so much and keep researching because I don't want to give up halfway. Suddenly, I noticed that a bright spot appeared in the middle of the magnifying glass facing the sun, and soon, the bright spot burned, and sure enough, it was the smell of burning, and it also smoked, and there was a golden spark. I moved the highlight to the side, and slowly, it burned too!

I clapped my hands and jumped. I didn't expect the sun to burn paper through a magnifying glass, which is really amazing. I was excited and triumphant and thought:

I discovered a scientific truth. At this time, I realized that it was not a fire falling from the sky, but a natural aura.

I called a few good classmates to come to my house to play. I couldn't wait to do an experiment with my findings, and they applauded.

Now, I understand that it is because the sun's light is reflected on the magnifying glass, so that in the center of the magnifying glass, there will be a bright spot in the place where it is contrasted, and the heat of the bright spot can burn the paper like fire, but it has to be done slowly. I am very proud to know this principle now, because I have discovered a scientific truth from life, experiments, and accidents.

Read books and newspapers to the elderly.

Zoom in on tiny objects within a certain range for easy viewing.

If you magnify things optically, you can also gather light!

Magnifier Usage:

1. An achromatic lens without chromatic aberration can observe the identification of ** and gemstones very clearly, with a packaging box, light and easy to carry.

2. It can also be used for jewelry certification testing, quality and color correction of the surface of the substrate.

Magnifier can be divided into portable magnifying glass and desktop magnifying glass according to the appearance classification, desktop magnifying glass can be fixed, there is a base below, above is a magnifying glass, the shape of the magnifying glass can be rectangular or square, or round, such a magnifying glass is mainly used for long-term fixation to see a place.

1. Prepare a plastic bottle.

2. Cut off the top half of the plastic bottle.

3. Measure the size with the lid of this plastic bottle and draw two small circles.

4. Use scissors to cut down the two small circles that have been drawn.

5. This is what it looks like when it is cut, we will overlap the two plastic circles that have been cut, and glue the surrounding areas together with a hot melt glue gun, and after gluing, it will be a convex lens, which is very similar to our reading glasses. But it's important to note here that we don't stick it all together and leave a small gap.

6. Put the glued "convex lens" into the water, and constantly squeeze the mirror surface to let the water pour into it.

7. It is best to squeeze out the air inside, and then squeeze it into the water, and try not to leave bubbles in the convex lens. When the water is filled, glue the small opening.

8. The final convex lens does not drip water, there are no bubbles in it and it is filled with water, even if it is a successful convex lens, it does have the effect of enlarging the font.

Magnifying glass is a kind of use of a convex lens, which is to make the object distance less than the focal length, and obtain a magnified virtual image. When the object distance changes, the image distance also changes, and the law is: 1 object distance + 1 image distance = 1 focal length.

For the use of magnifying glass, it is also stipulated that the magnification of the image at the photopic distance (25 cm) is the magnification of this magnifying glass, so the following formula can be derived: magnification = 1+25 f, where f is the focal length and the unit is centimeter.

In order to see tiny objects or details of objects, it is necessary to move the object closer to the eye, which can increase the angle of view and create a large real image on the retina. But when the object is too close to the eye, it is impossible to see clearly. In other words, it is necessary to be discerning, not only to have a large enough angle of the object to the eye, but also to take the appropriate distance.

Obviously, these two requirements are mutually restrictive for the eye, and a convex lens in front of the eye can solve this problem. A convex lens is the simplest magnifying glass, a simple optical instrument that helps the eye observe tiny objects or details.

Magnifier: A simple visual optical device used to observe the tiny details of an object, which is a converging lens with a focal length much smaller than the photopic distance of the eye. So what are the characteristics of a magnifying glass?

1. The lens of the magnifying glass is characterized by thick in the middle and thin and transparent edges, and the greater the convexity, the greater the magnification.

2. The imaging characteristics are magnification, uprightness, ipsilateral and virtual image.

That's all there is to know about the characteristics of a magnifying glass.

Convex. The magnifying glass is thick in the middle and thin at the edges, and the larger the angle of view of the magnifying glass, the larger the image, and the more you can distinguish the details of the object. Moving closer to an object increases the angle of view, but is limited by the ability of the eye to focus.

Use a magnifying glass to keep it close to your eyes and place the object in its focal point to form an upright virtual image. The role of a magnifying glass is to magnify the viewing angle. Historically, the use of the magnifying glass was proposed by Gros Test, a bishop of England in the 13th century.

The magnifying glass is thick in the middle and thin at the edges, so it is also called a convex lens. The larger the angle of view of the magnifying glass, the larger the image, and the more you can distinguish the details of the object. Moving closer to an object increases the angle of view, but is limited by the ability of the eye to focus.

Use a magnifying glass to keep it close to your eyes and place the object in its focal point to form an upright virtual image. The role of a magnifying glass is to magnify the viewing angle. Historically, the application of the magnifying glass is said to have been proposed by Grostest, a bishop of England in the 13th century.