Probably the most common lens has one flat (plano) surface and one convex surface resulting in a positive focal length. Plano convex lenses are typically used for focusing or collecting light in optical systems.Yutai optics manufactures a full range of focal lengths and materials to meet most applications. N-BK7 ,fused silica,Ge, Si, ZnSe, CaF2 are the most common materials used. These lenses can also have antireflective coatings to improve performance from UV to NIR wavelengths.
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