BK7 BiConcave lens
Description
Lenses are classified by the curvature of the two optical surfaces. A lens is biconvex (or double convex, or just convex) if both surfaces are convex. If both surfaces have the same radius of curvature, the lens is equiconvex. A lens with two concave surfaces is biconcave (or just concave). If one of the surfaces is flat, the lens is plano-convex or plano-concave depending on the curvature of the other surface. A lens with one convex and one concave side is convex-concave or meniscus. It is this type of lens that is most commonly used in corrective lenses.
If the lens is biconvex or plano-convex, a collimated beam of light passing through the lens will be converged (or focused) to a spot behind the lens. In this case, the lens is called a positive orconverging lens. The distance from the lens to the spot is the focal length of the lens, which is commonly abbreviated f in diagrams and equations.
BK7 BiConcave lens
Specifications |
|
|---|---|
| Material: | BK7 |
| Diameter: | 25.4 mm |
| Focal Length: | 100 mm |
| Edge Thickness, Te: | 3.0 mm |
Applications
Laser
Telescope
Medical
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How to order?
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Ships from:
China
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Sold by:
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On FindLight:
since 2015
Frequently Asked Questions
A BK7 BiConcave lens is a lens with two concave surfaces.
A biconvex lens has two convex surfaces, while a biconcave lens has two concave surfaces.
The distance from the lens to the spot is the focal length of the lens.
The applications of this lens include laser instruments, telescopes, and medical equipment.
The material used for the lenses is H-K9L or Fused Silica.