LE1156 25.4 mm Dia. N-BK7 Positive Meniscus Lens; EFL=125mm Uncoated

The LE1156 is a spherical lens with a convex-concave design, featuring a base shape of a circle. This lens, sourced from Thorlabs, has a diameter of 25.4 mm and a thickness at the edge of 2 mm, with a center thickness of 3.3 mm. The effective focal length (EFL) of this lens is 125 mm, making it suitable for a variety of optical applications.

The lens is made from N-BK7, a type of glass manufactured by Schott, which is known for its excellent optical properties. The radii of curvature for this lens are R1 = 40.6 mm and R2 = 106.9 mm, contributing to its positive meniscus shape. The back focal length (BFL) is 121.2 mm, and the lens does not have any coating, as indicated by the empty 'coating' field in the item data.

The wavelength for this lens is 587.6 nm. This wavelength falls within the visible light spectrum, suggesting that this lens could be used in applications involving visible light. However, it's important to note that the lens's performance may vary depending on the specific conditions of its use.