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Meniscus Lens

One side of meniscus lens is convex, another side is concave. It can be a convergent lens or a divergent lens, which is decided together by refractive index, curvature and radius.
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Specifications:
Materials:BK7, Fused Silica,Ge,Si, CaF2...
Diameter:1.5—300mm
Diameter Tolerance:+/-0.02 mm
Thickness Tolerance:0+/-0.02mm
Centring Error<3 Arc minute
Surface Quality:20—10
Surface Figure:λ/10@633nm 
Clear Aperture:90% 
Coating: Specified by customers 
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