What is an optical lens, and the flatness of an optical lens
An optical lens is an optical element made of transparent materials (such as glass, crystal, etc.), which will affect the curvature of the wavefront of light. It is a device that can converge or disperse light, and the resulting images have real and virtual images. It is widely used in various fields such as security, car wearing, digital camera, laser, optical instrument and so on.
A variety of common colorless optical glasses including fused silica, calcium fluoride, magnesium fluoride, silicon, germanium, zinc selenide and other materials; as well as plano-convex lenses and biconvex lenses of various bands, Plano-concave lens, double-concave lens, super hemispherical lens, small ball lens, meniscus lens, cylindrical lens, rod lens, cemented lens, etc.
The lens is made according to the law of light refraction.
Lens is an optical element made of transparent materials (such as glass, crystal, etc.). The lens is a refracting lens, and its refractive surface is a transparent body with two spherical surfaces (part of the spherical surface), or one spherical surface (part of the spherical surface) and one plane. The images it forms have real and virtual images. Lenses can generally be divided into two categories: convex lenses and concave lenses. The central part is thicker than the edge part called convex lens, there are three kinds of biconvex, plano-convex, and concave-convex; the central part thinner than the edge part is called concave lens, there are three kinds of bi-concave, plano-concave, and convex-concave p>
What is an optical lens? The flatness of an optical lens——Shenzhen Wangxinsheng Technology Mirror, Window, prism or flat mirror, and other plane deviations. You can use an optical flat crystal to measure this deviation, which is a high-quality, high-precision reference plane for comparing the smoothness of samples. When the plane of the tested optical product is placed against the optical flat crystal, stripes will appear, the shape of which represents the surface smoothness of the tested optical product. If these fringes are equally spaced and are parallel straight lines, then the optical surface to be inspected is at least as flat as the reference optical flat crystal. If the fringe is curved, the number of fringes between two dashed lines (one dashed line is tangent to the midpoint of the fringe, and the other dashed line crosses the end point of the same fringe) will indicate a smoothness error. The deviation of smoothness is usually measured by the ripple value (lambda;), which is composed of multiple wavelength test sources. One fringe corresponds to 1/2 wavelength. A smoothness of 1 lambda; indicates a general quality level; a smoothness of 1/4 lambda; indicates an accurate quality level; a smoothness of 1/20 lambda; indicates a high-precision quality level