relative refractive index
dišan-e šekasti-ye bâzâni
Fr.: indice de réfraction relatif
The ratio of the sine of the angle of incidence to the sine of the angle of refraction for a ray passing out of one of the media into the other.
Fr.: synthèse soustractive
Color produced by mixing pigments rather than light. Mixing all of the subtractive colors together results in the color black. See also → additive color.