| 释义 |
Helmholtz-Keteller formula Helmholtz-Keteller formula[′helm‚hōlts ′ked·əl·ər ‚fȯr·myə·lə] (optics) A dispersion formula in which the difference between the square of the index of refraction and unity is set equal to a sum of terms each of which is associated with a resonant wavelength of the medium. |