Question

$ques \: - what \: u \: mean \: by \:refraction$
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Answer 1

Explanation:

refraction. A change of direction that light undergoes when it enters a medium with a different density from the one through which it has been traveling — for example, when, after moving through air, it passes through a prism. (Compare reflection.)

Answer 2

Refraction is the bending of light (it also happens with sound, water and other waves) as it passes from one transparent substance into another.