48-682 9mm Dia. x -18mm FL; Uncoated; Double-Concave Lens
- Type
- Lens
- Subtype
- Spherical Lens (Concave-Concave)
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 9 mm
- EFL
- -18 mm
- BFL
- -18.49 mm
- R1
- -18.86 mm
- R2
- 18.86 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
48-682 9mm Dia. x -18mm FL; Uncoated; Double-Concave Lens
The 48-682 is a spherical lens with a base shape of a circle, sourced from the reputable vendor, Edmund Optics. This lens falls under the category of a concave-concave or double-concave lens, characterized by its inwardly curved surfaces on both sides. The lens has a diameter of 9mm and a focal length of -18mm, making it a negative lens that diverges light rays.
The lens's geometry includes a thickness of 2.45mm at the edge and 1.5mm at the center. The radii of curvature for the first and second surfaces are -18.86mm and 18.86mm, respectively. The back focal length (BFL) is -18.49mm, and the effective focal length (EFL) is also -18mm. The lens does not have any coating, as indicated by the empty 'coating' field in the item data.
The lens is made of N-BK7 Schott, a popular optical glass known for its excellent optical properties, including high transparency and low dispersion. The wavelength for this lens is 587.6nm, which is in the yellow-green part of the visible light spectrum.
More Lens
