Refraction
refraction is the change the direction of wave propagation due to change in it's transmission medium. the phenomenon is explained by the conservation of momentum. owing to the change of medium, the phase velocity of the wave changed but it's frequency remains constant. the of refraction we have learned that refraction occurs a light passes across the boundary between two media. refraction is merely one of several possible boundary by which a light wave could behave, light wave travel in straight lines through empty space (a vacuum), bur more interesting things happen to them when they travel through other materials especially when they move from one material to another. that's not unusual: we do the same thing ourselves.
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