Convex lens imaging rules

After the parallel beam passes through the convex lens, it converges at one point due to refraction, which is called the focal point, and the distance from the focal point to the center of the convex lens is called the focal length.

They answered in too much detail, and I was the same as them.

In the imaging law of convex lens, the quantitative relationship between object distance, image distance and focal length is: 1 f=1 u+1 v

The qualitative relationship is:

Object distance (u) The nature of the image Image distance (v).

u > 2f handstand, zoomed out, real image fu = 2f handstand, equal size, real image v = 2f (image size to stupid group vertice).

f< u<2f handstand, zoom in, real image v > 2f

u = f does not image the virtual and real of the image, upright and inverted, the image is on the same side and opposite side of the turning point).

u < f upright, magnified, virtual v > u

Note: In the calculation using the formula 1 f=1 u+1 v, it should be noted that:

The above equation is applicable to all kinds of lenses, when using this formula to solve the problem, if it is a virtual image cluster, the image distance v should be substituted with a negative value; In the case of concave lenses, the focal length should also be substituted as a negative value. On the contrary, through calculation, it is concluded that the image distance of a certain image is negative, and its image with Zheng Tang must be a virtual image; If the focal length of a lens is negative, the lens must be a concave lens;

Convex lens imagingThere are the following rules of Tan travel:

Rule 1: When the object distance is greater than 2x the focal length, the image distance is between 1x the focal length and 2x the focal length, and it becomes an inverted and reduced real image. At this time, the image distance is smaller than the object distance, the image is smaller than the object, and the object image is on the opposite side.

Rule 2: When the object distance is equal to 2 times the focal length of the Hunger Shirt, the image distance is also 2 times the focal length, forming an inverted and equal-sized real image. At this time, the object distance is equal to the image distance, the image and the object are equal in size, and the object is on the opposite side.

Rule 3: When the object distance is less than 2 times the focal length and greater than 1 times the focal length, the image distance is greater than 2 times the focal length, and it becomes an inverted and magnified real image. At this time, the image distance is greater than the object distance, the image is larger than the object, and the object image is opposite.

Rule 4: When the object distance is equal to 1 times the focal length, it will not be imaged, and it will be emitted as parallel light.

Rule 5: When the object distance is less than 1 times the focal length, it becomes an upright and magnified virtual image.

At this time, the image distance is greater than the object distance, the image is larger than the object, and the object image is on the same side.

Applications of Convex Lenses:

The lens of the camera is a convex lens, the scene to be illuminated is the object, and the film is the screen. The light that hits an object is diffusely reflected.

The image of the object is formed on the final film by means of a convex lens; The film is coated with a layer of light-sensitive substance, which undergoes a chemical change after **.

The image of the object is recorded on film.

The relationship between object distance and image distance is exactly the same as that of convex lenses. As the object approaches, the image gets farther and farther away, larger and larger, and finally becomes a virtual image on the same side. The object distance increases, the image distance decreases, and the image becomes smaller; The object distance decreases, the image distance increases, and the cavity becomes larger.

One double focal length is divided into virtual and real, and two times the focal length is divided into size.

As follows: 1. When the object distance is greater than 2 times the focal length, the image distance is between 1 times the focal length and 2 times the focal length, and it becomes an inverted and reduced real image. At this time, the image distance is smaller than the object distance, the image is smaller than the object, and the object image is on the opposite side.

2. When the object distance is equal to 2 times the focal length, the image distance is also 2 times the focal length, forming an inverted and equal size real image. At this time, the object distance is equal to the image distance, the image and the object are equal in size, and the object is on the opposite side.

3. When the object distance is less than 2 times the focal length and greater than 1 times the focal length, the image distance is greater than 2 times the focal length, and it becomes an inverted and magnified real image. At this time, the image distance is greater than the object distance, the image is larger than the object, and the image is located on the opposite side of the object.

4. When the object distance is equal to 1 times the focal length, it will not be imaged, and it will be emitted as parallel light.

5. When the object distance is less than 1 times the focal length, it will become an upright and magnified virtual image. At this time, the image distance is greater than the object distance, the image is larger than the object, and the object image is on the same side.

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 optical screen is called a real image; An image that is formed by the convergence of the reverse extension lines of light rays and cannot be displayed on the light screen is called a virtual image. When talking about the difference between real and imaginary images, such a distinction is often mentioned:

The real image is upside down, while the virtual image is upright. ”

The imaging law of the convex lens refers to the fact that the object is placed outside the focus, and an inverted real image is formed on the other side of the convex lens, which can be distributed and guessed as the three cases of shrinking, magnifying and equal size, Zhaoshan general object distance greater than 2 times the focal length is reduced, the object distance is equal to 2 times the focal length of the same size, and the object distance is less than 2 times and greater than 2 times the focal length, which is magnification.

What is the imaging law of a convex lens.

When I study physics in junior high school, I will learn the imaging law of convex lens, and the imaging law of convex lens is an optical law, and we generally call the image that can be presented on the light screen as a real image, and vice versa is a virtual image, and generally the real image is inverted, and the virtual image is upright.

The imaging law of convex lens is to put the object outside the focus and invert the real image formed on the other side of the convex lens, which can be divided into three situations: shrinking, magnifying and equal size. When the object distance is greater than 2x focal length, the image distance is between 1x focal length and 2x focal length, showing an inverted and reduced real image.

When the object distance is equal to 2 times the focal length, the convergence is also at 2 times the focal length, presenting an inverted and equal-sized real image. However, if the object distance is less than 2 times the focal length and more than 1 times the focal length, the distance is greater than 2 times the focal length, and the real image is inverted and magnified.