High quality Different Sizes of Doublet Optical Achromatic Lens

A convex lens is composed of a transparent mirror body ground into a spherical surface on both sides, with thin sides and thick middle. A concave lens is composed of a transparent mirror body that is ground into a concave spherical surface on both sides, with both sides thick and the middle thin. Convex lenses converge on light, while concave lenses diverge on light; Convex lenses are refractive imaging, while concave lenses are "light rays passing through a concave lens form an upright virtual image, while convex lenses form an inverted real image. Real images can be displayed on the screen, but virtual images cannot.".

Lens is the most basic optical element that constitutes the optical system of a microscope. Components such as objective lens, eyepiece, and condenser lens are composed of a single or multiple lenses. According to their different shapes, they can be divided into two categories: convex lenses (positive lenses) and concave lenses (negative lenses).