LP11-25-150 25.4 mm Dia. N-BK7 Plano-Concave Lens; EFL=-150mm Uncoated

This is a Plano-Concave Spherical Lens, sourced from CeNing Optics, with a diameter of 25.4 mm and a center thickness of 2 mm. The lens is made of N-BK7 Schott, a popular optical glass due to its excellent optical properties and wide transparency range. The lens has an effective focal length (EFL) of -150 mm, indicating that it is a diverging lens, which spreads out light rays and makes them appear to come from a virtual point behind the lens.

The lens's geometry includes an inner radius of 0 mm and an outer radius of 0 mm, suggesting that it is a simple meniscus lens with both surfaces curved. The curvature of the concave surface is specified as -77.8 mm, which is the radius of curvature.

The lens is uncoated, meaning it does not have any anti-reflective coating. This might result in unwanted reflections, especially when working with high-intensity light sources or when the lens is used at a large angle from the incident light. However, uncoated lenses are generally less expensive and can be suitable for many applications.

The lens is designed to work at a wavelength of 546.1 nm, which is in the green part of the visible light spectrum. This makes it suitable for applications that use green light, such as certain types of fluorescence microscopy or laser-based systems.

Please note that the lens's specifications are valid and it is currently in stock, according to the vendor's website.