At night many people see rings (called entoptic halos) surrounding bright outdoor lamps in otherwise dark surroundings. The rings are the first of the side maxima in diffraction patterns produced by structures that are thought to be within the cornea (or possibly the lens) of the observer's eye. (The central maxima of such patterns overlap the lamp.) Would a particular ring become smaller or larger if the lamp were switched from blue to red light? Smaller Larger If a lamp emits white light, is blue or red on the outside edge of the ring? Blue Red Current Attempt in Progress Light of wavelength 460 nm is incident on a narrow slit. The angle between the first diffraction minimum on one side of the central maximum and the first minimum on the other side is 1.12. What is the width of the slit? Number i Units eTextbook and Media Sound waves with frequency 3900 Hz and speed 343 m/s diffract through the rectangular opening of a speaker cabinet and into a large auditorium of length 100 m. The opening, which has a horizontal width of 39.0 cm, faces a wall 100 m away (the figure below). -Speaker cabinet Central axis Along that wall, how far from the central axis of that wall in meters will a listener be at the first diffraction minimum and thus have difficulty hearing the sound? (Neglect reflections.) Number Units