Laurence, Lionel · London, School of Optics · leaf 334
e latter, so that light, from the slit, is rendered parallel by the lensbefore reaching the prism. In the centre of the circle there is a small tableB on which the prism is placed. The Spectrometer is a spectroscope with the addition of a scale of degreeson which the position of the movable… … Fig. 337. A Direct Vision Spectroscope (Fig. 337) is formed of a train of, say, threecrown and two flint prisms mounted in opposition in a tube. The prisms aresuch that there is no ultimate deviation for yellow light, while there is a con-siderable separation of the red and violet. A is a slit…
Optics
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