The function and imaging rule of optical lens

The role of the lens in the optical system is:aggregation,collimation,imaging,the lens generally needs to be plated anti-reflection film to reduce the reflection of the surface of the lens,which can reduce the loss of light energy,imaging more clearly.

An optical lens is an optical element made of a transparent substance (such as glass, crystal, etc.)that affects the wavefront curvature of light.It is a device that can focus or disperse light,and the resulting image has a real image and a virtual image.Widely used in security,car wear,digital camera,laser, optical instruments and other fields.
Including fused quartz,calcium fluoride,magnesium fluoride,silicon,germanium,zinc selenide and other materials including a variety of general colorless optical glass;And a variety of bands of plano-convex lens,convex lens,plano-concave lens,double concave lens,super hemisphere lens,ball lens,meniscus lens,cylindrical mirror,rod mirror,glued mirror and so on.
Imaging rules of lens and convex lens:

1.The lens is indicated by the lens symbol (there are two V-shaped signs at both ends of a line segment),the main optical axis is drawn,the light center is marked,and the focus is based on the intersection point of two of the three special rays of the lens (generally the light of the light center and the light of the main optical axis are better),and the characteristics of the image formed by the lens can be obtained (such as true or false,size, positive and reverse, etc.).

2.During lens imaging,all the light on the lens announced by each point on the object is imaged in the same direction,blocking a part of it does not affect the imaging of other light rays directed towards the lens,so you can still see the intact image,but because the light emitted to the image is reduced,the brightness of the image on the screen will be dimmed.

3.Convex lens imaging rules:A condition for convex lens to meet the demand for real image is
(1)Conjugate imaging refers to the fact that the size of the object distance and the image distance can be exchanged, and the two cases are respectively expanded and reduced into the inverted vertical image.
(2) Looking at the wall clock outside the double focal length through the convex lens, the image of the second hand is still rolling in the clockwise direction, because at this time, the real image is inverted, and the reverse direction is still the normal direction, so it is still rolling in the clockwise direction.
The lens is indicated by the lens symbol (there are two V-shaped signs at both ends of a line segment), the main optical axis is drawn, the light center is marked, and the focus is based on the intersection point of two of the three special rays of the lens (generally the light of the light center and the light of the main optical axis are better), so that the characteristics of the image formed by the lens can be obtained (such as true or false, size, positive and reverse, etc.).
(3) When lens imaging, all the light on the lens announced by every point on the object is imaged in the same direction, blocking a part of it, and does not affect the imaging of other light emitted to the lens, so you can still see the intact image, but because the light emitted to the image is reduced, the brightness of the image on the screen will be dimmed.

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