The SLB-20-80N is a Plano-Concave Lens, a type of spherical lens, sourced from OptoSigma. This lens has a base shape of a circle and is uncoated. The lens is designed with a diameter of 20.0 mm and a thickness at the edge of 3.2 mm, while the center thickness is 2.0 mm. The effective focal length (EFL) of this lens is -80.0 mm, making it a negative or diverging lens.
The lens's first radius of curvature (R1) is -41.52 mm, and the back focal length (BFL) is -81.3 mm. The lens does not have an inner or outer radius, indicating that it is a simple plano-concave lens. The material used in the construction of this lens is n-BK7 Schott, a common material in optical lenses due to its excellent optical properties.
The lens is designed to operate at a wavelength of 546.1 nm. The provided weblink leads to the vendor's page, where users can find more information about the lens and its availability.