0190511203

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Optics - Lenses
• 0190511203 Application Field and Working Principle
• Application Field
The use of lenses is widespread in the world nowadays. They are used in optical instruments such as microscopes, telescopes, binoculars, magnifying glasses, etc. Its basic purpose is to form an image by properly converging or diverging the light from an object. Lenses are also used in various production fields, such as cameras, optical communications, optical measurements, laser beam shaping, etc. The wide application of lenses is closely related to its excellent performance, depends on its unique refracting, reflecting and combining properties.
• Working Principle
The working principle of the lens is to change the direction of light propagation by refraction, and the image quality is better than that of the reflection mirror. The working principle of the lens is based on the principle of geometrical optics, such as the laws of reflection and refraction; it is also based on the properties of Snell\'s law.When light passes through a lens, it is refracted at each surface, and the refraction direction changes due to the refractive index of the lens, and the focal length of the lens varies with the shape of the lens. When a single point is viewed through a single optical element, the light is formed into a diverging cone. If the conical light beam is perpendicular to the optical axis, the center of the cone is the optical center of the optical element. If the incident light is parallel to the optical axis, the central point of the converging cone is called the focus of the lens, which is the focal point of the lens. The sharpness of the image obtained by the lens varies with the distance between the lens and the object to be imaged. When the distance is equal to the focal length of the lens, the image is the sharpest. When the object is close to the lens, the image is virtual, magnified and enlarged, and the location is on the same side of the lens as the object. When the object is far away from the lens, the image is real, reduced and erect, and the location is on the other side of the lens.
• Conclusion
The application field of lenses is extensive and varied. In optical instruments, lenses are used for imaging and magnifying objects. In production fields, lenses are applied in a large range of fields, such as optics, optical communications, and laser beam shaping. The working principle of the lens is based on the law of reflection and refraction, and Snell\'s law. With proper use and maintenance, lenses can provide high-quality images.

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