The of a wave is the bending of a wave as it passes through one medium to another medium.

Refraction is the change of direction and speed that a wave experiences when passing from one medium to another with different refractive index. It only occurs if the wave strikes obliquely on the separation surface of the two media and if they have different refractive indices. The refraction originates in the change of velocity of propagation of the indicated wave.

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answer; sociological imagination;