During an investigation, a student aimed a beam of light through a round *1 point opening in an opaque barrier. The light passing through the opening travelled to a screen a short distance away. When the student repeated the procedure with the beam going through a smaller opening, he found that the circular projection of light on the screen became larger with less distinct edges. What is responsible for the change in characteristics of the circular projection? diffraction of light O refraction of light O reflection of light O polarization of light