Refraction

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Change in the direction of propagation of radiation determined by change in the velocity of propagation in passing through a non-homogeneous medium, or in passing from one medium to another.

Reference: C.I.E. (modified)

Note: This phenomenon appears only when the angle of incidence is different from 90 degrees.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

English