49-853 25.4mm Dia. x 101.6mm FL; Plano-Convex Lens Uncoated

The 49-853 is a Plano-Convex lens with a diameter of 25.4mm and a focal length of 101.6mm, sourced from the reputable optical components vendor, Edmund Optics. This lens is uncoated, offering users a bare, unaltered optical surface.

The lens's geometry is characterized by a convex shape on one side, with a radius of curvature of 52.51mm, and a flat surface on the other. The center thickness of the lens measures 4mm, while the edge thickness is 2.44mm. The back focal length, which is the distance from the rear surface of the lens to the focal point, is 98.97mm. The lens's effective focal length (EFL), which is the distance from the lens's principal plane to its focal point, is the same as its focal length, at 101.6mm.

The lens is made of N-BK7 Schott glass, a popular material for optical components due to its excellent optical properties and wide transparency range. The material's refractive index at the specified wavelength of 587.6nm is not provided in the data, but it can be looked up in the Schott glass catalog.

Please note that the lens is uncoated, which means it does not have any anti-reflective coatings. This may result in unwanted reflections, especially when working with high-intensity light sources or when the lens is used at large angles of incidence. However, the uncoated surface can be advantageous in certain applications where the user wants to control the phase or polarization of light.