Define the term retraction of light
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When the light enters a transparent object and path of light is changed it is called refraction of light.
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the change of direction of a ray of light, sound, heat, or the like, in passing obliquely from one medium into another in which its wave velocity is different. ... the ability of the eye to refract light that enters it so as to form an image on the retina. the determining of the refractive condition of the eye.
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