T Smith 1930 Trans. Opt. Soc. 32 85 doi:10.1088/1475-4878/32/3/301
T Smith
Show affiliationsThe optical positions (μ ν) of the glass types catalogued by the Parsons Optical Glass Company, and the relations between the dispersions for several segments of the visible spectrum, are exhibited graphically. It is shown that a knowledge of the refractive indices of any glass for three wave-lengths is sufficient to specify the index for the whole of the visible spectrum, and a knowledge of two indices is almost sufficient. In particular the partial dispersive ratios are almost functions (nearly linear functions) of ν only. This implies that there are no glasses suitable for making apochromatic telescope objectives of large relative aperture.
The graphs show that the general standard of accuracy of the measured indices is high.
A new graphical method of interpolating refractive indices for glass is obtained.
Issue 3 ( 1 January 1930)
Received 10 January 1931
T Smith 1930 Trans. Opt. Soc. 32 85
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