Refraction
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Refraction
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The process in which the direction of energy propagation is changed as the result of a change
in density within the propagating medium, or as the energy passes through
the interface representing a density discontinuity between two media. In the
first instance the rays undergo a smooth bending over a finite distance. In
the second case the index of refraction changes through an
interfacial layer that is thin compared to the wavelength of the radiation;
thus, the refraction is abrupt, essentially discontinuous. See atmospheric refraction. Compare reflection, diffraction, scattering.
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References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use