FIELD: optics. SUBSTANCE: objective includes primary concave parabolic mirror, secondary spherical mirror and correction element. Correction element is made of three lenses with same refractive index. Extreme lenses are negative and are produced in the form of meniscuses facing space of images with concavity and central lens is biconvex. EFFECT: improved quality of image and expanded spectral range of operation. 5 dwg, 1 tbl
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