Optical lenses generally refer to lenses that can transmit and adjust visible light. It is a lens made of qualified optical glass. The optical lens has stable optical properties and high optical uniformity, and the hardness of the optical lens is also high. Optical lenses can be made into lenses, prisms, intraocular lenses, etc. to correct vision, eliminate visual fatigue, and protect or treat eyes.
Lenses are made according to the laws of refraction of light. A lens is an optical element made of transparent substances (such as glass, crystal, etc.). The lens is a refractor, and its refraction surface is a transparent body with two spherical surfaces (one part of the spherical surface), or one spherical surface (one part of the spherical surface) and one plane. It has both real and virtual images.
The lens is the basic optical element that composes the microscope optical system. The objective lens, eyepiece and condenser lens are all composed of single or multiple lenses. According to their different shapes, they can be divided into two categories: convex lenses, also called positive lenses, and concave lenses, also called negative lenses.
Convex lens: thick in the middle, thin in the edge, there are three types of biconvex, planoconvex, and concave;
When a beam of light parallel to the main beam passes through the convex lens and is compared to a point, this point is called the "focal point", and the plane passing through the focal point and perpendicular to the optical axis is called the "focal plane". There are two focal points. The focal point in the object space is called the "object-side focus", and the focal plane there is called the object-side focal plane. On the contrary, the focus in the image-side space is called the image-side focus, and the focal plane there Called the image square focal plane.
After the light passes through the concave lens, it forms an upright virtual image, while the convex lens side forms an inverted real image. The real image can be displayed on the screen, but the virtual image cannot.
Lenses can be widely used in various fields such as security, automotive, digital cameras, lasers, optical instruments, etc. With the continuous development of the market, lens technology is becoming more and more widely used.