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The process of bending of light i.e, refraction occurs because speed of light is different in different medium. As a ray of light enters into a medium from other medium it tend to move towards or away from the normal depending upon the density of the mediums
Bending of light is caused due to collision of light particle i.e. photon with greater no. of particles present in denser medium , due to successive collisions light bends , more denser medium more will be the bending , & this phenomenon is so called "Refraction "

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