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N-BK7 Plano-Concave Spherical Lenses

Thorlabs' N-BK7 plano-concave lenses diverge a collimated beam from a virtual focus and are commonly used in Galilean-type beam expanders. Plano-concave lenses have a negative focal length and negative spherical aberration, which can be used to balance out aberrations of other lenses in the system.