Double Concave Lens

Double Concave Lens

Double concave lens has negative focal length like plano concave lens. But Parallel incident rays diverge outwards.The principle of the geometric mapping for the imaging of the double concave lens is the same as that of the convex lens. From the top of the object are also two straight lines: one parallel to the main optical axis, after passing through the double concave lens deflected into the divergent light, the refracted light back to the main focus in the opposite direction; The other passes through the optical center of the lens, and these two lines intersect at a point, which is the image of the object

The Common glass Refractive index

Parameter of Bi Convex Lens

Material:BK7 Fused Silica CaF₂ MgF₂ Sapphire Germanium Silicon ZnSe ZnS.

Diameter:0.5-600mm

Dia Tolerance:+/-0.02mm

Thickness Tolerance:+/-0.01mm

Centeration<30 arcmin

Flatness<1/20 lambda

Surface Quality:10-5

Coating: AR BBAR HR.