Plano-concave lenses are thicker at the edge than in the center and flat on another surface. Plano concave lens (PCV) has negative focal length. So the lenses are used to bend parallel input rays so they can diverge from one another making them useful for beam expansion and image reduction applicati......
| Material | N-BK7, UV fused silica, JGS1,N-SF11, Silicon, Germanium, etc. | 
| Diameter available | 1.5mm to 700mm | 
| Tolerance | +/-0.05mm | 
| Thickness tolerance | +/-0.05mm | 
| Surface quality | 20/10 or better | 
| Surface accuracy | Lambda/4 or better | 
| Centering | 1 arc min | 
| Chamfer | protective | 
| Coating | anti reflective coating for visible, UV, infrared wavelengths and reflective coating for the concave surface, mirror coating | 



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