| 摘要 |
FIELD: physics.SUBSTANCE: lens consists of two components separated by an air gap. The first component on the beam path is glued from a biconvex and a biconcave lens, the second component consists, on the beam path, of a separate biconcave lens and a separate biconvex lens. The radii of the optical surfaces of the biconvex lens of the second component are equal in magnitude and the following relationships hold: 1.63<n=n<1.7; 1.7<n<1.9; where n, n, nare refraction indices of the material on the beam path of the first, second and fourth lenses for the spectral line D.EFFECT: high aperture ratio, larger field angle in the object space and high technological effectiveness.1 dwg, 2 tbl |
