The function and imaging laws of optical lenses, we should know a lot about glass lenses, lenses on mobile phone cameras, camera lenses, etc., the lens is an optical element made of a transparent material whose surface is part of a spherical surface, and a lens is composed of several lenses. It consists of two kinds of plastic lenses and glass lenses. The lens is an optical element made of transparent substances (such as glass, crystal, etc.), which will affect the wavefront curvature of light. It is a device that can aggregate or disperse light, forming both real and virtual images. Widely used in security, vehicle belts, digital cameras, lasers, optical instruments and other fields. Let's take a look at the role of optical lenses.
1. The role of optical lenses
Lenses can be widely used in security, car wear, digital cameras, lasers, optical instruments and other fields. With the continuous development of the market, lens technology is becoming more and more widely used. (lens) 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 whose refraction surface is a transparent body with two spherical surfaces (a part of the spherical surface), or a spherical surface (a part of the spherical surface) and a plane. It has both real and virtual images. Convex lens: thick in the middle and thin at the edge, there are three types of biconvex, plano-convex, and concave; concave lens: thin in the middle, thick at the edge, and there are three types of biconvex, plano-convex, and convex-concave. Second, the imaging law of optical lens
1. The lens is represented by a lens symbol (there are two V-shaped marks at both ends of a line segment), draw the main optical axis, mark the optical center and focus to refract two rays according to two of the three special rays of the lens (usually used as a light beam). The intersection of the central ray and the ray parallel to the main optical axis is better), the characteristics of the image formed by the lens (such as virtual and real, size, positive and negative, etc.) can be obtained.
2. When the lens is imaging, all the rays of light emitted by each point on the object that hit the lens are imaged in the same position, blocking a part of it, and does not affect the imaging of other rays of light hitting the lens, so the complete image can still be seen, However, since the light hitting the image is reduced, the brightness of the image on the screen will be dimmed.
3. Convex lens imaging law:
(1) One of the conditions that a convex lens needs to meet to form a real image is
(2) Conjugate imaging means that the size of the object distance and the image distance can be interchanged.
4. When looking at a clock with a double focal length through a convex lens, the image of the second hand still rotates clockwise. Because it is an inverted real image at this time, it is still a normal direction when viewed upside down, so it still rotates clockwise.
The lens is represented by the lens symbol (there are two V-shaped marks at both ends of a line segment), draw the main optical axis, mark the optical center, and the focal point according to the two refracted rays of the three special rays of the lens (usually made the optical center). The intersection of the ray and the ray parallel to the main optical axis is better), the characteristics of the image formed by the lens (such as virtual and real, size, positive and negative, etc.) can be obtained.
5. When the lens is imaging, all the rays of light emitted by each point on the object that hit the lens are imaged in the same position, blocking a part of it, and it does not affect the imaging of other rays of light hitting the lens, so the complete image can still be seen. However, since the light hitting the image is reduced, the brightness of the image on the screen will be dimmed.
Time:06 Aug 2022
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