The eyes of cats, foxes, raccoons, and many other mammals brightly reflect light that shines into them back toward the source and makes the animal’s eyes seem to glow as seen in Figure Q25.16. The reflection occurs within a thin membrane behind the retina called the tapetum lucidum, which allows the animal’s eye more sensitivity at night. There is no metallic material within the eye, and the membrane does not look metallic under magnification. Describe a mechanism that might produce a bright reflection.