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Large aperture achromatic lens - has radii of curvature …

1992-5-27 · The wide aperture achromatic lens has two spherical refractive surfaces with respective curvature radii (r1,r2), which together with the thickness (d) of the lens, the refractive coefficient of the lens material and the spacing (a1) of the object from the first lens surface are defined by a series of specified equations.

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