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refraction British & World 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 British & World English

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

seismic refraction British & World English

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

angle of refraction British & World English

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