Answers are grounded in this paper and cite their sources.
The refractive index is defined in terms of momentum and energy changes in first-order transitions of a system consisting of the particles of a refractive medium in interaction with the electromagnetic field.
No takes yet. Share an insight, caveat, or question.
S. M. Neamtan (1954) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: