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re·frac·tion

n 1  :  the deflection from a straight path undergone by a light ray or a wave of energy in passing obliquely from one medium (as air) into another (as water or glass) in which its velocity is different  2 a  :  the refractive power of the eye  b  :  the act or technique of determining ocular refraction and identifying abnormalities as a basis for the prescription of corrective lenses .
 
 

 
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