Newall, H. F · London : Society for Promoting Christian Knowledge · leaf 42
angement just described.The slit is perpendicular to the plane of the paper. n] newtons discovery, 1675 35 and is formed by two sharp-edged jaws of metalwhich can be moved further apart or closer togetherby means of a screw. The refracting edge of theprism is also perpendicular to the paper, and is… … Fig. 21. the colours is produced by the fact that the prismdeviates the beam of parallel green rays more thanthe beam of parallel red rays. The object-glassreceives these two beams, and forms the correspondingred and green images of the slit in its focal plane,in such positions that the two lines…
Spectroscope · Spectrum analysis
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