What is the function and processing principle of optical glass imaging convex lens?

Convex lens has magnification, convex lens twice the focal length of the size, one times the focal length of the real virtual positive.

The parallel light (such as sunlight) parallel to the main optical axis (the line of the spherical center of the two spheres of the convex lens is called the main optical axis of the lens) into the convex lens, the light after two refraction on both sides of the lens, concentrated on a point on the axis, this point is called the focus of the convex lens (mark F), the convex lens has a focus on both sides of the mirror, such as a thin lens, The distance between the two focal points and the lens ZX is approximately equal. The focal length of a convex lens is the distance from the focal point to the lens ZX, usually expressed as f. The smaller the radius of the convex lens, the shorter the focal length.

Main axis: Through the convex lens two spherical spherical centers C1, C2 line called the convex lens main optical axis.

Optical center: The ZXO point of a convex lens is the optical center of the lens.

Focus: Light rays parallel to the main axis will converge on a point F on the main optical axis after passing through the convex lens, which is the focus of the convex lens.

Focal length: The distance between the focus F and the center O of the convex lens is called focal length and is represented by f.

Object distance: The distance from the object to the center of the convex lens is called the object distance, expressed by u.

Image distance: The distance from the image formed by the convex lens to the optical center of the convex lens is called the image distance, expressed by v.

The object is placed outside the focus and forms an inverted real image on the other side of the convex lens, which has three kinds of reduction, equal size and amplification. The smaller the object distance, the larger the image distance, the larger the real image. The object is placed within the focal point and becomes a virtual image of the convex lens standing upright and enlarged. The smaller the object distance, the smaller the image distance, the smaller the virtual image.

In optics, the image formed by the actual light, called the real image, can be carried on by the light screen; On the contrary, it is called virtual image and can only be felt by the eye. Experienced physics teachers, when telling the difference between real and virtual images, often mention such a distinction method: "Real images are upside down, and virtual images are upright.

The three virtual images of flat mirror, convex mirror and concave lens are all upright. The real image made by concave mirror and convex lens, as well as the real image made by pinhole imaging, are all upside down without exception. Of course, concave mirrors and convex lenses can also form virtual images, and the two virtual images they form are also upright states.

Is the image made by the human eye real or virtual? We know that the structure of the human eye is equivalent to a convex lens, so the image of the external object on the retina must be the real image. According to the above empirical rule, the object on the retina seems to be upside down. But any object we see on a regular basis is clearly upright, right? This conflict with the "law of experience" actually involves the role of the cerebral cortex and the adjustment of life experience

When the distance between the object and the convex lens is greater than the focal length, the object becomes an inverted image, and this is like the light from the candle to the convex lens converges through the lens, which is the convergence point of the actual light, which can be undertaken by the light screen, and is the real image. When the distance between the object and the convex lens is less than the focal length, the object becomes a upright virtual image.