FIELD: physics; optical spectral devices. SUBSTANCE: spectroscope has radiation channel which in turn has optical slot connected optically with concave spherical mirror, flat diffraction grating and exit window. Scale channel of spectroscope has wavelength scale, flat mirror and concave spherical mirror, which is optically connected with exit window through transparency area of flat diffraction grating. EFFECT: improved efficiency of operation. 2 cl, 2 dwg
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