refractive index (of a medium) index of refraction (symbol: n)

at a point in a medium and in a given direction, the ratio of the velocity of light in vacuum to the magnitude of the phase velocity of a sinusoidal plane wave propagating in that given direction

u tački sredine i u datom pravcu, odnos brzine svetlosti u vakuumu i fazne brzine sinusoidnog ravanskog talasa koji se prostire u tom datom pravcu

u tački sredine i u datom pravcu, odnos brzine svetlosti u vakuumu i fazne brzine sinusoidnog ravanskog talasa koji se prostire u tom datom pravcu