GLA11 Series N-BK7 Plano-Convex Lenses, Uncoated

Surface irregularity: λ/4 at 632.8 nm
Surface flatness: λ/2
Spherical power: 3λ/2
Refractive index (nd): 1.517
Abbe number (Vd): 64.17
Uncoated transmission range: 350 nm–2.0 µm

Plano-convex lenses have one plano surface and one convex surface. They are positive lenses suitable for focusing collimated light or collimating light from a point source. To minimize spherical aberration, the curved surface should generally face the collimated beam.

For a thin plano-convex lens in air, the focal length can be approximated by:
f = R / (n - 1)

where n is the refractive index and R is the radius of curvature.