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What is the principle of a lens

A lens is an optical element made of transparent material with a surface that is a spherical part. The lens is composed of several lenses, including plastic lenses (* * * static) and glass lenses (glass). Glass lenses are more expensive than plastic. Usually, the lens structures used by * * * include: 1P, 2P, 1G1P, 1G2P, 2G2P, 4G, etc. The more lenses, the higher the cost. Therefore, a high-quality * * * should use glass lenses, which have better imaging effects than plastic lenses and play an important role in fields such as astronomy, military, transportation, medicine, and art. So what is its principle?

Used for a type of glass or plastic component on * * * that can change the direction of light or control the distribution of light.

Lenses are the basic optical components that make up the optical system of microscopes. The objective, eyepiece, and condenser components are all composed of a single or multiple lenses. According to their different shapes, they can be divided into two categories: convex lenses (positive lenses) and concave lenses (negative lenses).

When a beam of light parallel to the main optical axis intersects at a point after passing through a convex lens, 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 focal point", and the focal plane at this point is called the "object focal plane"; On the contrary, the focal point in the image space is called the "image focal point", and the focal plane at that point is called the "image focal plane".

After passing through a concave lens, light forms an upright virtual image, while a convex lens forms an inverted real image. Real images can be displayed on the screen, while virtual images cannot.

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