Are the two focal lengths the same for convex lenses that are inconsistent on both sides?

In principle, two convex lenses with the same focal length can be used.

The telescope is made up, but the magnification is 1, and the distant object appears to be the same size as if viewed directly with the naked eye, so it has no practical significance. The focal length of the eyepiece of an actual telescope is much smaller than that of an objective lens, and it is used to magnify the real image created by an objective lens with a very long focal length. The ratio of the focal length of an object is the magnification of the telescope.

Magnification (magnification) Objective focal length Eyepiece focal length You can do your own experiments to prove it: Prepare two identical small magnifications (common with a diameter of 50 mm, magnification of 2 to 3 times) and a high magnification (common diameter of 20 mm, magnification of 5 to 10 times) for a total of 3 magnifiers.

After that, I will do my own experiments and observations. In some cities, there are so-called "dollar stores", where you can buy these magnifying glasses very cheaply. Reading glasses.

Teleopia lenses) can be used in place of the above objectives. However, reading glasses below 300 degrees have a very long focal length, and you almost have to stretch your arm to make an objective. The lower the power of the reading glasses, the longer the focal length and the greater the magnification of the telescope that makes up it.

Drawing a diagram of the optical path can also prove the problem. But seeing is believing.

Hello, I am glad to serve you and give you the following answer: the difference in focal length on the left and right sides of the convex lens is caused by the inconsistent curvature of the convex lens, in this case, the light will have different reflection angles on the left and right sides of the convex lens, resulting in different focal lengths. There are two ways to solve this problem:

1.Use a higher precision convex lens, which reduces differences in curvature and results in more consistent focal lengths. 2.

Li A's use of optical strogging design software to adjust the curvature of the convex lens, so that the focal length is more consistent. Steps:1

First, using optical design software, the curvature of the convex lens is designed to make the focal length more consistent. 2.Then, a higher precision convex lens is used to reduce the difference in curvature, resulting in a more consistent focal length.

3.Finally, using optical design software, adjust the curvature of the convex lens to make the focal length more consistent. Personal Tips:

When adjusting the curvature of the convex lens, make sure that the difference in curvature is less than a certain value to ensure the consistency of the focal length. In addition, the use of higher precision convex lenses is also a good option to effectively reduce the difference in curvature, resulting in a more consistent focal length.

Hello, I am glad to serve you and give you the following answers: the focal length of the left and right sides of the convex lens is different because of the optical characteristics of the convex lens, in this case, in order to adjust the focal length of the convex lens, it is necessary to correct the parameters of the convex lens, such as the radius of curvature and thickness of the convex lens. The steps to adjust the focal length of a convex lens are as follows:

1.Firstly, the physical parameters of the convex lens were determined, including radius of curvature, thickness, material, etc. 2.Secondly, the optical design software is used to calculate the optical parameters of the convex lens, such as focal length. 3.

Then, according to the actual application requirements, the optical parameters of the convex lens are adjusted to achieve the focal length that meets the requirements. 4.Finally, according to the adjusted optical parameters, the remainder calculates the physical parameters of the convex lens and manufactures the actual lens. The above are the steps to adjust the focal length of the convex lens, and the relevant knowledge you need to know includes the optical properties of the convex lens, the use of optical design software, and the manufacture of convex lenses.

Suppose the focal length of the first convex lens is f1 and the focal length of the second convex lens is f2, the two are very close, the center distance of the two convex lenses is d, and the center of the lens of the first convex lens is used as the center of the merged lens. There is a beam of parallel light into lens 1, forming a bright spot at the focal point, after putting the convex lens 2, this bright spot is used as the object of the second convex lens, then the distance between this object and the second lens is u2=-(f1-d).

Since the left side of the second convex lens is positive, then the right side is negative, and the following can be used to calculate the position of the image formed by the second bright hand of the convex lens by using the formula of the imaging law of the convex lens 1 u2 + 1 v2 = 1 f2, and the focal length of the convex lens combination can be calculated with this image distance.

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 focal length of a convex lens is the distance from the focal point to the center of the chain in the lens.

Introduction to Convex Lenses:

Convex lenses are thicker lenses with thinner edges. Convex lenses are made according to the principle of refraction of light. Convex lenses are divided into the forms of double convex, plano-convex and concave and convex (shed or 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 and converging, which is related to the thickness of the lens.

Farsighted glasses are convex lenses.

Focal length: Focal length, also known as focal length, is a measure of the concentration or divergence of light in an optical system, which refers to the distance from the center of the lens to the focal point of light concentration when the parallel light is incidence. The focal length is the distance from the optical center of the lens in a camera to the imaging plane such as the floor, CCD, or CMOS.

Optical systems with short focal lengths have a better ability to concentrate light than optical systems with long focal lengths.

The lens of a camera is a set of lenses, and when the light parallel to the main optical axis passes through the lens, the light converges to a point, which is called the focal point, and the distance from the focal point to the center of the lens (i.e., the center of light) is called the focal length. Lenses with a fixed focal length, i.e., prime lenses; A lens whose focal length can be adjusted is a zoom lens.

Convex lens measures focal length:

Conjugate method: use the light fixture base to fix the position of the light source and the light screen, and measure their spacing l. Place the convex lens with the focal length to be measured in the middle and move the convex lens along the main axis to make the image of the light source inverted twice on the light screen.

The position of the lens during the two imaging is recorded, and the distance d of the lens movement during the two imaging processes is obtained, and the focal length f of the convex lens can be calculated according to the formula, which is called the conjugate method.

Parallel light focusing method:

According to the characteristics of the convex lens, let the parallel light (such as sunlight) incident on the convex lens along the main axis direction, place a light screen parallel to the lens on the other side, adjust the position of the light screen to make the spot on the light screen the smallest and brightest, and the distance between the lens and the light screen is the focal length of the convex lens. This is an easy way to roughly measure the focal length of a convex lens.

Far Object Imaging:

In the laboratory, the focal length of the convex lens can also be estimated by the distant object imaging method instead of the parallel light focusing method, which is similar to the parallel light method. Adjust the position of the light screen so that distant objects, such as those in a classroom window or outside the window, are imaged on the light screen, and the distance between the light screen and the lens is approximately the focal length of the lens.

Focal length, also known as focal length, refers to the distance from the center of the lens to the focal point where light is concentrated. A convex lens can cause light parallel to the main optical axis to converge at a point, which is called the focal point. The distance from the focal point to the center of light is called the focal length. There are two solid focal points on the convex lens, one on the left and one on the left.

A method for measuring the focal length of a convex lens. Put the convex lens facing the sunlight, put a piece of white paper on the other side of the convex lens, and adjust the distance between the convex lens and the white paper, so that a smaller and brighter spot appears on the white paper, and this spot is the focus. Use a ruler to measure the distance from the convex lens to the focal point, which is the focal length.