Angle of Refraction
The angle at which a reflected ray of light leaves a surface as measured from normal.
Anisotropic
Term used in gemology for double refraction.
At an angle of incidence of 10° the angle of refraction g in diamond is 5° (sin 10° = 0.1738), at an angle of incidence of 20° (sin 20° = 0.342) It is about 9°, and so on.
As the light's frequency changes, so does its angle of refraction. Higher light frequencies travel through the stone more slowly, while lower frequencies travel faster, causing a spreading effect known as dispersion.
 See also: Gemstone, Diamond, Length, Gemstones, Surface
  
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