Baly, E. C. C. (Edward Charles Cyril), b. 1871 · London, Longmans, Green · leaf 203
ffraction 6, and p is the radius of curvature of the grating, therefore nX = bi iin i -^ b sin -P Diiferentiating, sin i being constant, ndX = ^-costdpP P dpd\ np ~ pbcos-P This shows us that ^, or what may be called the linear THE DIFFRACTION GRATING 85 dispersion of the spectrum, is, at any given… … 6 being inversely proportional to its order. This has alreadybeen proved before. Furthermore, the equation shows that thedispersion is a minimum when p = o, i.e. at the centre ofcurvature of the grating; the linear dispersion is then equal to i86 SPECTROSCOPY -J-, and is constant; that is to say,…
Spectrum analysis
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