What is the difference between convex lenses and convex lenses

The situation of convex lens imaging varies depending on the relative position between the object and the focal point. It can be broadly divided into 6 types of situations.

1) When the object is located at infinity, the image distance v f becomes a real image with a magnification k 0. It can be used to determine focal length;

2) When U2F, the position of the image F v 2F, which is an inverted real image with a magnification of k 1. The eye and the camera are equivalent to this imaging relationship;

3) When U=2F, V=2F, then it is an inverted real image with a magnification of K 1, that is, the size of the object image is equal;

4) 2f u f, 2f v, inverted real image, k 1, magnified image, slide projector, microscope, are all this kind of imaging relationship;

5) When u f, then v has no image at this time, and k magnified, and the searchlight is this optical relationship;

6) F U, V 0, upright virtual image, K 1 magnification, magnifying glass is this optical imaging relationship.

Convex lens imaging rules.

When the object is placed outside the focal point, it becomes an inverted real image on the other side of the convex lens, and there are three types of real images: reduced, equal size, and magnified. The smaller the object distance, the larger the image distance, and the larger the real image. The object is placed in focus, and the virtual image is magnified upright on the same side of the convex lens.

The smaller the object distance, the smaller the image distance, and the smaller the virtual image.

I'll answer the second one.

Lenses in life.

Camera, projector, telescope, reading glasses.

First of all, both concave and convex lenses are thin lenses, and the propagation direction of light through the optical center of the concave and convex lenses does not change.

Secondly, in terms of the convex nucleus and the lens, the light parallel to the main optical axis is refracted through the convex lens and the light is emitted through the focal point, and the light rays that enter the convex lens through the focal point are refracted and emit parallel to the main optical axis.

For the concave lens, the rays parallel to the main optical axis are refracted through the concave lens, and the rays that are refracted through the virtual focus are reversed, and the rays that are hit at the imaginary focus on the other side of the concave lens are refracted and emit parallel to the main optical axis.

The above are the three special rays of the concave lens and the convex lens, as shown below.

For a convex lens, it has a focal point on the left and right sides. Both of these foci are solid foci. Actual light is converging.

For a concave lens, it has a focal point on the left and right sides. Both of these foci are imaginary foci. It is not formed by the convergence of actual light.

Convex lenses are made according to the principle of refraction of light. Convex lenses are thicker lenses with thinner edges. Convex lenses are divided into the forms of double convex, plano-convex and concave and convex (or positive meniscus), convex lenses have the effect of converging rays, so they are also called converging lenses, and thicker convex lenses are expected to be far away, converging and other effects, which are related to the thickness of the lens.

Farsighted glasses are convex lenses.

The law of convex lens imaging is an optical law. In optics, the image that is formed by the convergence of actual light rays and can be presented on the light screen is called a real image, so what is the difference between a convex lens and a concave lens?

1. Structure: The edge of the convex lens is thin and the middle is thick, and at least one surface should be made into a sphere, or both sides can be made into a sphere. It can be divided into three types: biconvex, plano-convex and concave-convex lenses.

The edge of the concave lens is thick and the middle is thin, and at least one surface should be spherical, or both sides should be spherical. It can be divided into three types: double concave, plano-concave and convex and concave.

2. Imaging properties: The convex lens is refractive imaging, and the image can be inverted or reduced; Inverted, equal-sized real images; inverted, magnified real images; Upright, magnified virtual image. It has a converging effect on light.

Concave lenses are reflected images, which can only be formed into upright and reduced virtual images. It has a divergent effect on light.

The above is an introduction to the difference between convex and concave lenses.

In fact, you can distinguish convex lenses and concave lenses with different compositions, different applications, different effects, etc., convex lenses are a refractive phenomenon, thick in the middle of the lens, thin on both sides, like inverted, shrinking, and have a pooling effect on light, Bu Huai buried farsighted glasses are convex lenses, and concave lenses are thin in the middle, thick on both sides, and myopia glasses are concave lenses.

Convex lens Generally speaking, the main composition of convex lens and concave lens is different, their principle is opposite, convex lens is called positive ball lens, its lens is very thick in the middle, very thin on both sides, mainly convex type, has a converging effect on light, and concave lens is very thin in the middle of the lens, very thick on both sides, concave.

Concave lens convex lens is the object after reflection or refraction, the actual light generated by the final re-convergence of the image, in the convex lens into the image is inverted, shrinking, farsighted glasses are convex lens, and concave lens is the image formed by the reverse extension of light, mainly used in solar cookers, table lamps, etc., myopia glasses are also concave lenses.

Convex lens Convex lens is a kind of refractive imaging, the image it makes can actually be directly with the naked eye, can also be received with a light screen, generally can be tested with a light bulb, can produce parallel light is a convex lens, and Ming's can not produce parallel light is a concave lens, and concave lens is a kind of reflection imaging, into a virtual image.