This is a 35 mm diameter concave-convex spherical mirror from Edmund Optics, designed for use in the 700-10000nm wavelength range. The mirror has a protected gold coating on the front surface, which provides high reflectivity and durability. The concave shape of the mirror, with a radius of curvature of -30mm, focuses incoming light to a point, making it ideal for use in focusing and imaging applications. The mirror has a focal length of 15mm (EFL), which is the distance from the mirror surface to the focused point. The mirror has a thickness of 6mm at the edge. It is made from N-BK7 glass, a high-quality borosilicate crown glass known for its excellent optical properties and low auto-fluorescence. This mirror is a versatile and reliable component for a wide range of optical systems.