# this file is part of refractiveindex.info database
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REFERENCES: |
    G. Ghosh.
    Dispersion-equation coefficients for the refractive index and birefringence of calcite and quartz crystals.
    <a href="https://doi.org/10.1016/S0030-4018(99)00091-7"><i>Opt. Commun.</i> <b>163</b>, 95-102 (1999)</a>
COMMENTS: |
    Ordinary ray (o). Room temperature.
CONDITIONS:
    direction: o
DATA:
  - type: formula 2
    wavelength_range: 0.204 2.172
    coefficients: 0.73358749 0.96464345 1.94325203e-2 1.82831454 120