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Spherical Lenses - Bi-Convex Lenses
Bi-convex lenses have a positive focal length. When the object and image distance are equal (1:1 magnification), not only is spherical aberration minimized, but also coma, distortion, and chromatic aberration are identically canceled due to the symmetry. Bi-convex lenses most suitable where the object and image are on opposite sides of the lens and the ratio of the image and object distances (conjugate ratio) is between 0.2 and 5.O utside this magnification range, plano-convex lenses are usually more suitable.
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