SLB-20-60N 20.0 mm Dia. x -60.0 mm FL; Plano-Concave Lens Uncoated

The SLB-20-60N is a Plano-Concave Lens, part of the Spherical Lens family, sourced from OptoSigma. This lens is uncoated and features a base shape of Circular. The lens has a diameter of 20.0 mm and a thickness edge of 3.6 mm, with a center thickness of 2.0 mm. The effective focal length (EFL) of this lens is -60.0 mm, making it a negative or diverging lens.

The lens's inner radius is 0 mm, and the outer radius is also 0 mm, indicating a uniform curvature. The first radius of curvature (R1) is -31.14 mm, and the back focal length (BFL) is -61.3 mm. The material used for this lens is n-BK7 Schott, a popular choice for its high refractive index and low dispersion.

This lens is designed to operate at a wavelength of 546.1 nm. The lack of coating on this lens means it will have a higher reflectivity compared to coated lenses, which may be desirable for certain applications. However, it's essential to consider that uncoated lenses can lead to reduced image quality due to internal reflections.

Please note that the web link provided is valid and indicates that the lens is in stock, making it readily available for your optical needs.