15. Huygen's wave theory of light explained diffraction by stating which of the following: a. Light cannot actually bend around barriers and is instead colliding with other particles rather than

spreading out. b. Because light appears not to curve, it must only travel in a straight line c. Each point passing through an opening acts as a new point source for spherical wavelets. d. Incident light rays hit points on the reflecting surface, which then in turn act as point sources for spherical wavelets.