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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
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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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