Double Convex Lenses

Double Convex Lenses consist of two convex surfaces with equal radius, which can focus light into a point with a positive focal length. Due to the symmetry of the two sides, it is a more suitable single element in 1:1 imaging applications. It is often used in imaging relay systems and imaging of objects at a limited conjugate distance or focusing, collimating, and expanding beams. The characteristic of double convex lenses is that the larger the conjugate ratio, the greater the aberration produced. Double convex lenses are suitable for situations where the object and image are on both sides of the lens, and the ratio of image distance to object distance (conjugate ratio) is between 0.2 and 5.