In a perfectly dark room, Raj and Yuri are standing with their backs against opposite walls. A candle is lit exactly in the center of the room. Can Raj and Yuri see each other's faces? Provide a very brief response.
Raj and Yuri can see each other's faces because the candle in the center of the room sheds light in all directions. Since both Raj and Yuri are within the reach of the candle's light, their faces will be illuminated by the light from the candle, making it possible for them to see each other, despite being on opposite sides of the room. Light allows us to see objects because it reflects off those objects and enters our eyes; in this case, the light from the candle will reflect off their faces, enabling sight.