127mm bi concave glass optical lens

    127mm bi concave glass Optical Lens

Convex Lens is the image formed by refraction imaging, which can be positive or inverted; Virtual and real; Release and shrink.  Concave mirror is a reflection image that can be reduced or enlarged into an inverted real image or an upright enlarged virtual image. Astigmatism lens (including convex lens) is an instrument that transmits light and uses light to form an image after folding. Light abides by the law of refraction. A mirror (including a convex mirror) is not an instrument that transmits light, but reflects it back to form an image. Light obeys the law of reflection.

Material: K9, BK7, FS, UVFS, CaF₂, ZnSe

Diameter:3mm-200mm±0.05mm

Center Thickness Tolerance:±0.05mm

Lens Alignment Error:≤3min

Surface Accuracy:λ/ 10 @

Surface Quality:40/20. 60/40. 80/60

Effective Caliber: 90%

         Example with BK7 material：These N-BK7 Meniscus Lens are available uncoated or with one of five antireflection coatings (-A, -AB, -B, -C, or -D), which reduces the amount of light reflected from each surface of the lens (see the Selection Guide table below for coating option). Since approximately 4% of the incident light is reflected at each surface of an uncoated substrate, the application of an AR coating improves transmission, which is important in low-light applications, and prevents the undesirable effects (e.g., ghost images) associated with multiple reflections. Having optics that are AR coated on both surfaces is particularly desirable for applications utilizing multiple optical elements. Please see the Graphs tab for additional coating information.