For an object located at the focal point of a lens A. the image is (approximately) at the focal point. B. the image is at the center of the lens. C. the image is at infinity. D. no image is formed. For a distant object (object distance much larger than the focal length) A. the image is (approximately) at the focal point. B. the image is at the center of the lens. C. the image is at infinity. D. no image is formed. When light is reflected at the boundary where the material the light is being reflected by has a lower index of refraction than the material the light is traveling in (light within glass bouncing from the glass-air interface, e.g.) then A. the phase of the wave is inverted (180 phase change), since it is a \"hard\" boundary. B. the phase of the wave is unchanged, since it is a\"soft\" boundary. C. the phase of the wave is randomized. D. the statement is nonsense, no light will not be reflected