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Abbe number (dispersion)

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Abbe number (dispersion) diagram
The Abbe number (V) is a commonly used measure of dispersion (the rate of variation of refractive index with wavelength), particularly in the gemstone and jewelry industry.
D-line (589.2 nm)
F-line (486.1 nm)
C-line (656.3 nm)

Abbe number
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Fill in the measured refractive indices at the three required wavelengths, and the Abbe number for the material will be calculated in the orange box.
For low dispersion materials, the Abbe number is large. Typical glasses vary between Abbe numbers of ~20 (e.g. for fluorinated materials) to ~90 (generally high index materials).