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These lenses are thicker at the edge than in the centre and flat on one side. The plano-concave lenses are used to expand light beams or to increase focal lengths in optical systems. Specifications Material: BK7 or UV fused silica Design Wavelength: 546.1nm Design Index: BK7: 1.5183 ± 0.0005 Fused silica: 1.46008 ± 0.0005 Diameter Tolerance: +0.0, -0.15mm Paraxial Focal Length: ±2% Centration: 3 arc minutes Clear Aperture: >80% Surface Irregularity: λfirstname.lastname@example.org Surface Quality: 60-40 scratch and dig Protective Bevel