FIELD: optics. SUBSTANCE: the lens has an axially symmetric form and a correction surface. The correction surface is the inner boundary of joint of two glasses with different indices of refraction and meant for obtaining of aberration-less focusing spot of a parallel radiation beam. The correction surface has a wave-line shape, and the glasses have different dispersion factors. EFFECT: enhanced relative aperture of lens, enhanced correction of spherical and chromatic aberrations, and reduced lens thickness in axis. 3 dwg
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