Why does the relatve motion of light differs than the relative motion of other larger bodies and why do the newtons laws of motion not applicable in case of light? cant we consider a photon travelling in a direction with speed of c.

Dear siddharth,

The newtonian laws have proved valid for all mechanical problems not involving speeds comparable with the speed of light and not involving atomic particles. 

Newton's laws are valid only in an inertial reference frame. Any reference frame that is in uniform motion with respect to an inertial frame is also an inertial frame, i.e. Galilean invariance.

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