This is a 48-762 Plano-Convex Lens, a high-quality optical component sourced from Edmund Optics. The lens boasts a 20.0mm diameter and a focal length of 70.0mm, making it suitable for a wide range of applications.
The lens is made from n-BK7 Schott, a popular optical glass due to its excellent optical properties and versatility. It has a refractive index of 1.51680 at 587.6nm, which contributes to its high-performance capabilities.
The lens features a Plano-Convex geometry, meaning one side is flat (Plano) and the other side is curved (Convex). The curvature of the lens is defined by a radius of 36.18mm, which is the radius of the curvature of the convex surface.
The lens is coated with Edmund Optics' NIR-I standard curve coating on both the front and back surfaces. This coating enhances the lens's performance in the near-infrared region, specifically between 600nm and 1050nm.
The lens has a thickness of 1.59mm at the edge and 3mm at the center. The back focal length (BFL) is 68.03mm, and the effective focal length (EFL) is 70mm. The lens does not have an inner or outer radius.