What kind of optical element is a lens?
2025-02-23
A lens is an optical component made of a transparent material (such as glass, crystal, etc.).
A lens is an optical element made of a transparent material (such as glass or crystal). Convex lenses: thicker in the middle and thinner at the edges, there are three types: double convex, plano-convex, and concavo-convex; concave lenses: thinner in the middle and thicker at the edges, there are three types: double concave, plano-concave, and convexo-concave. Lenses play an important role in astronomy, military, transportation, medicine, art and other fields.
Lenses are made according to the law of refraction of light. A lens is a refracting lens whose refracting surfaces are two spherical surfaces (part of a spherical surface), or one spherical surface (part of a spherical surface) and one plane transparent body. The image it forms can be a real image or a virtual image.
Lenses can be widely used in various fields such as security, vehicle-mounted, digital cameras, lasers, and optical instruments. With the continuous development of the market, lens technology is becoming more and more widely used.
A thin lens is a lens in which the thickness of the central part is much larger than the radius of curvature of its two surfaces. Initially, cameras only had a single convex lens, hence the name "single lens". With the development of technology, modern lenses are composed of several convex and concave lenses of different forms and functions to form a converging lens, called a "compound lens". The concave lens in the compound lens plays a role in correcting various aberrations.
Optical glass has high transparency, purity, colorless, uniform texture, and good refractive power, so it is the main raw material for lens production. Due to different chemical compositions and refractive indices, optical glasses include: flint glass, crown glass, and lanthanum crown glass.
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