Sample supply K9 convex lens, glued lens, quartz glass lens, coated lens

A convex lens is a lens with a thicker central part. Convex lenses can be divided into biconvex, flat convex, and concave convex (or crescent shaped) forms. Thin convex lenses have convergence effects, hence they are also known as focusing lenses. thicker convex lenses have effects such as telescope, divergence, or convergence, which are related to the thickness of the lens. The parallel light (such as sunlight) is parallel to the axis (the line connecting the spherical centers of the two spherical surfaces of the convex lens is called the main optical axis of the lens) and shines into the convex lens. After the light is refracted twice on both sides of the lens, it is concentrated at a point on the axis, which is called the focus of the convex lens (marked F). The convex lens has a focus on both sides of the mirror. In the case of a Thin lens, the distance between the two focuses and the center of the lens is approximately equal. The focal length of a convex lens refers to the distance from the focal point to the center of the lens, usually represented by f. The smaller the spherical radius of a convex lens, the shorter the focal length. Convex lenses can be used for magnifying glasses, glasses worn by people with presbyopia and hyperopia, lenses for microscopes, telescopes, etc. A transparent body with both sides having a spherical surface or one side having a spherical surface and the other side having a plane, and a thinner middle part, is called a concave lens. There are three types of lenses: double concave, flat concave, and convex concave. The line connecting the curvature centers on both sides is called the main axis, and the central point O is called the optical center. The light passing through the optical center does not refract no matter where it comes from. A beam of light parallel to the main axis, when refracted on a concave lens, diverges in all directions. The extension line that opposes its divergence direction will all converge at one point F on the same side as the light source, and the refracted light is exactly emitted from point F, which is called the virtual focal point. There is one on each side of the lens. A concave lens is also known as a divergent lens. The focal length of a concave lens refers to the distance from the focal point to the center of the lens. The larger the spherical curvature radius of the lens is, the longer its focal length will be. If it is a Thin lens, the focal length on both sides will be equal.