This is a 12mm diameter, 20mm focal length double-convex lens, sourced from Edmund Optics. The lens is made of fused silica (mal-1965) and features a standard visible (VIS) coating on both the front and back surfaces, designed to the VIS 0° standard curve.
The lens has a center thickness of 4.37mm and an edge thickness of 2.27mm. The front and back focal lengths are 17.63mm and -17.63mm respectively, with a back focal length of 18.44mm. The lens is designed to operate at a wavelength of 587.6nm.
The lens's geometry is spherical, with no inner or outer radius specified. The lens is designed for use in the ultraviolet (UV) range, specifically for wavelengths between 425nm and 675nm.
The item data indicates that this lens is in stock, and the web link provided leads to the product page on the Edmund Optics website.