Can anyone tell me what the hell is going on with convex lens imaging?!!

Convex lens imaging uses the principle of refraction of light.

We can see objects around us because the surface of the object emits or reflects light rays, and these rays carry information about the surface of the object. When the human eye receives these rays, the brain analyzes and processes them to obtain the image of the object.

Each point on the surface of the object constantly emits or reflects countless rays of light, usually in all directions, and these rays carry the same information about the surface of the object. Only a sufficient amount of light is concentrated to a point to achieve enough energy to stimulate the nerve impulses of retinal photoreceptor cells.

This is the process by which a point is seen. The lens of the human eye is like a convex lens, and the light emitted from a point other than one time of the focal length will converge to a point after passing through the convex lens. When the light emitted by all the points on the surface of the object is converging to their respective points after passing through the convex lens, it becomes a real image of an object.

The so-called real image is the image formed by the convergence of real light, which can be projected onto the screen and can be sensitive to light on the negative.

What you are talking about in your question is to use a convex lens as a magnifying glass to see things, and because the object is within the focal point, the angle of the light emitted after refraction is still not enough to converge to a point, and it cannot become a real image. However, the refracted light is still there (the knowledge is not enough to converge), and in the optical system composed of the lens of the human eye (which is also a convex lens) and this magnifying glass, it may converge to a point after the secondary refraction of the lens, and it can be seen by the human eye. (Note that the image cannot be formed within the focal point because the angle after refraction is still less than one point convergence, which is only a single lens.)

When there is a second lens, these rays of light that are not converged after refraction are still able to converge by secondary refraction).

Therefore, convex lens imaging has the following rules: the object distance greater than 2 times the focal length is a reduced real image, between 1 2 times the focal length is magnified real image, and within 1 times the focal length is a magnified virtual image (it can also be considered that there is no imaging, because the second lens of the human eye is used).

Then you should know what to do.

aWithin one time of the focal length.

The imaging rules of convex lenses are:

1.When u>2f, f>v>2f, it becomes an inverted, shrinking real image;

2.When f>u>2f, v>2f becomes an inverted magnified real image;

3.When u=2f, v=2f are orthostatic and equal in size;

4.When U=1F, V=1F, no imaging;

5.When u< F into an upright magnified virtual image.

Answer: These questions should be analyzed as follows:

1.When an object is at twice the focal length and the human eye is at the light screen, the light rays hitting the light screen converge and image, and also image on the retina of the human eye. As a result, the human eye will also see the actual image of the handstand zooming.

2.When the object is outside twice the focal length, the human eye is not in the position of the image, and the light entering the human eye cannot form a clear image on the retina, and the person cannot see the image clearly. It is similar to farsightedness when you can't see near objects clearly.

3.When the object is in focus, the emitted light is refracted by the convex lens and emits out in parallel, so that the human eye cannot see the object. If the object is a strong light source, the human eye sees only bright light.

4.The lens of the human eye acts as a convex lens, but the lens is regulated by the ciliary bodyCurvatureand thus changeFocal length。As the object moves closer to the eyeball, the focal length of the lens becomes shorter, allowing the object to always converge on the retina into a solid image.

Hope it helps.

1. If the object distance is greater than twice the focal length, the resulting image is a reduced inverted real image, and the human eye is a convex lens, and what is seen is a reduced inverted real image.

2. If the object distance is greater than twice the focal length, and the human eye puts it at one time the focal length, then what you see is a blurry image, which is not clear, but it is also a real image of inverted and reduced.

3. The object distance is equal to one time the focal length, and there is no imaging, so you can't see anything like it.

4. The closer the object is to the human eye, the clearer it will be. However, if the object distance is less than the focal length of the human eye, it will become a virtual image and cannot be displayed on the retina, so it cannot be seen.

If the eye is at the light screen, you can see the bright light, but you can't see the image, because it has just converged to image, just like you can't see (or can't see clearly) an object if you put it against your eye.

Test answers: (1) Candles, convex lenses, and light screens, the three are in the same straight line, and the centers of the three are roughly at the same height, so that the image can be presented in the center of the light screen (2) If there is no image on the light screen, it may be because the candle is within one time of the focal length of the convex lens, and it becomes a virtual image, and cannot be formed on the light screen It is possible that the candle is on the focal point of the convex lens and cannot be imaged It is possible that the center of the light screen, the convex lens and the candle flame are not at the same height, and the image cannot be formed on the light screen (3) The convex lens becomes an inverted and equal-sized real image, u=v=4fIf the distance between the candle and the light screen is less than 4 times the focal length of the convex lens, the light screen will not become an image as large as an inverted (4) Get an inverted and reduced image on the light screen, keep the position of the convex lens unchanged, when the candle gradually moves away from the convex lens, the object distance increases, the image distance decreases, and the light screen should be close to the convex lens Therefore, the answer is: (1) the same height; (2) The candle is within one of the focal length of the convex lens; The candle is located on the focal point of the convex lens; (3) The distance between the candle and the light screen is less than 4 times the focal length of the convex lens; (4) Proximity