Refraction phenomenon!! If Light rays fall on a transparent glass then they get refracted!! They first get absorbed by the electrons and then to another electron and so on till it emerges out of the glass!! But y does the light travel in straight path in the glass itself....how do the electrons particularly send the light in one and only one Direction??Infact light can be emmited in any direction by the electron??SO the Rectilinear Motion in highly Unlikely??