47-909 20mm Dia. x -40 FL; VIS 0deg Coated; Plano-Concave Lens 425-675nm
- Type
- Lens
- Subtype
- Spherical Lens (Plano-Concave)
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 20 mm
- EFL
- -40 mm
- BFL
- -42.31 mm
- R1
- -20.67 mm
Material
- Name
- N-BK7
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.5167984379050088
- λ
- 587.6 nm
- B1
- 1.03961212
- C1
- 0.00600069867 μm2
- B2
- 0.231792344
- C2
- 0.0200179144 μm2
- B3
- 1.01046945
- C3
- 103.560653 μm2
47-909 20mm Dia. x -40 FL; VIS 0deg Coated; Plano-Concave Lens 425-675nm
The 47-909 is a Plano-Concave Spherical Lens, a type of optical lens with a concave surface on one side and a flat surface on the other. This lens, sourced from Edmund Optics, boasts a 20mm diameter and a focal length of -40mm, making it suitable for a variety of applications.
The lens is constructed from n-BK7 Schott, a high-quality optical glass known for its excellent transparency and low dispersion. This material makes the lens particularly suitable for use in the visible spectrum, specifically between 425nm and 675nm.
The 47-909 features a standard coating on both the front and back surfaces. This coating, identified as 'edm vis-0 std curve', is designed to enhance the lens' performance in the visible spectrum. It provides improved transmission and reduces surface reflections, thereby increasing the overall efficiency and quality of the optical system in which it is used.
The lens has a thickness of 5.39mm at the edge and 3.5mm at the center. The inner and outer radii are both 0mm, indicating a uniform curvature across the concave surface.
