Abstract: A reflection spectrometer provided with a probe to which the radiation of at least one radiation source can be transmitted by at least one radiation emission conductor transmitter in such a way that said radiation source can be directed to or in an investigated object and which makes it possible to transmit radiation to or in an investigated object and/or emitted by such object to a radiation receiver that can be connected to an evaluation unit by means of at least one radiation emission conductor. The disclosure also relates to a transmitted light spectrometer which includes a probe to which the radiation of at least one radiation source can be transmitted by at least one radiation emission conductor in such a way that the radiation source can be directed to or in an investigated object.

Abstract: Lens for a laser-ignited internal combustion engine, with an at least approximately spherical basic shape, the lens (1) having an aspherical region (3) which is formed so that the lens (1) is at least approximately free from spherical aberration.

Abstract: A soda-lime glass containing vanadium which can be produced by the float process with high UV absorption for wavelengths below 350 nm. The glass comprises 70 to 74 weight % SiO.sub.2, 0 to 2 weight % Al.sub.2 O.sub.3, 0.1 weight % or less Fe.sub.2 O.sub.3, 0 to 0.15 weight % TiO.sub.2, 7.5 to 10 weight % CaO, 3.5 to 5.4 weight % MgO, 12 to 15 weight % Na.sub.2 O, 0 to 1 weight % K.sub.2 O, 0 to 0.02 weight % BaO, 0.1 to 0.3 weight % SO.sub.3, 3 to 7 weight ppm CoO and 0.1 to 0.3 weight % V.sub.2 O.sub.5.