This is a Plano-Convex Lens, sourced from the reputable vendor OptoSigma. The lens is designed with a base shape of a circle and is uncoated. It is a spherical lens, which is a type of lens that has at least one spherical surface. The lens is made from fused silica, specifically from the material ID fused sil mal-1965.
The lens has a diameter of 50.8 mm and a thickness at the edge of 2.9 mm. The thickness at the center of the lens is 6.5 mm. The effective focal length (EFL) of the lens is 200 mm, and the radius of curvature (R1) is 92 mm. The back focal length (BFL) of the lens is 195.6 mm. The lens is designed to work with a wavelength of 546.1 nm.
The lens is available from the vendor's website, and the link provided is valid and indicates that the lens is in stock. This lens is a great option for those looking for a high-quality, uncoated Plano-Convex Lens for their optical systems.