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Meniscus lens is a lens that has two curved spherical surfaces, one convex and the other concave. Around the middle, the meniscus lens is thicker than at the sides. Thus, with a rising beam waist and spherical aberration, the lens has a smaller beam diameter. When a meniscus lens is paired with another lens it shortens the focal length and increases the system's numerical aperture. This decreases the distortion of the image and increases the resolution of the image.
