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Refraction
Definition REFRACTION-
The fact or phenomenon of light, radio waves, eft., being deflected in passing obliquely through the interface between on medium and another or through a medium of varying density.
Explanation:
Refraction normally happens when light bends and is passes from a substance of one density into a substance of a different density.
Used for:
Refraction can be used for many things such as for glasses (near sighted, or far sighted), also for telescopes.