This is a Plano-Concave Lens, a type of spherical lens, sourced from the renowned optical components manufacturer, Laser Components. The lens, identified as PLCC-10.0/25.8C, has a base shape of a circle and is designed for use in systems operating at a wavelength of 633 nanometers.
The lens has a diameter of 10 millimeters and a center thickness of 2 millimeters. The effective focal length (EFL) of this lens is -50 millimeters, indicating that it is a diverging lens. The radius of curvature of the concave surface is -25.8 millimeters. The lens does not have any coating, as indicated by the empty 'coating' field in the item data.
The lens is made of N-BK7, a popular glass type in the optical industry known for its excellent optical properties. This glass type is produced by Schott, a leading glass manufacturer. The 'n-bk7 schott' Material ID suggests that the lens is made of this specific glass type.
The item data also provides a link to the datasheet of similar plano-concave lenses from Laser Components, indicating that this lens is in stock and available for purchase. The link can be found in the 'weblinks' field of the 'info' parameter.