This is a Plano-Concave Lens, type Lens, subtype Spherical Lens, from the renowned optical components vendor, Standa. The lens has a base shape of Circular and a geometry that includes a diameter of 50.8 mm, a thickness edge of 11.5 mm, and a thickness center of 5 mm. The effective focal length (EFL) is -100 mm, and the radius of curvature (R1) is -47.61 mm. The lens does not have an inner or outer radius.
The lens is made of UVFS Mal- 1965 material and is designed to work with a wavelength of 355 nm. The lens shape is spherical, and it does not have any coating. The lens is in stock and available for immediate purchase. For more information, please refer to the vendor's website at http://www.standaphotonics.com/lenses/plano-concave-lenses.php.