This is a Plano-Concave Lens, type of Spherical Lens, offered by Standa. The lens has a circular base shape with a diameter of 25.4 mm and a thickness that varies from 3.7 mm at the edge to 2.7 mm at the center. The effective focal length (EFL) of this lens is -150 mm, indicating that it is a diverging lens.
The lens is made of n-BK7 Schott material, a popular choice for its high refractive index and low dispersion. The wavelength for this lens is 546 nm. The lens does not come with any coating, as indicated in the item data.
The lens's geometry is defined by its inner and outer radii, both of which are 0 in this case. This means that the lens's curvature is consistent throughout, contributing to its Plano-Concave shape.
According to the item data, this lens is in stock and available for purchase. For more information, you can visit the vendor's website through the provided weblink.