An aquarium light bulb has a long, straight glowing filament surrounded by a tubular, clear glass bulb. This lighted bulb, with its filament oriented vertically, is placed \(1.0 \mathrm{~m}\) from a screen in an otherwise dark room. A thin sheet of cardboard is placed halfway between the filament and the screen so that no light can reach the screen. If a small hole, shaped like an equilateral triangle, is cut through the center of the cardboard sheet, describe the pattern of light that appears on the screen.