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refraction US English

The fact or phenomenon of light, radio waves, etc., being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density

double refraction US English

Division of a single incident light ray or other electromagnetic wave into two separate rays in an anisotropic medium

seismic refraction US English

The refraction of elastic waves on passing between bodies of rock having different seismic velocities

angle of refraction US English

The angle made by a refracted ray with a perpendicular to the refracting surface