refraction |riˈfrak sh ən|
noun Physics
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.
• change in direction of propagation of any wave as a result of its traveling at different speeds at different points along the wave front.
• measurement of the focusing characteristics of an eye or eyes.
ORIGIN mid 17th cent.: from late Latin refractio(n-), from refringere ‘break up’ (see refract ).

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