While I was watching a TV show on my iPad, a drop of water fell on it that seemed to create a small rainbow within the droplet. This rainbow is caused by the lensing effect that water droplets create due to their shape. The water creates what is called a convex lens, which bends light rays inward and makes objects appear closer. The distance between the lens and its focal point is called the focal distance of a lens, which increases as the curvature of the lens increases. The distance from the individual pixels on the screen, which create the checkered effect on the droplets, is fixed and depends on the thickness of the glass. The blurrier, more colorful droplets have focal distances that are closer to the distance from the pixels to the screen than those that are more checkered and colorless, which makes them more effective at magnifying the pixels. Apple uses LCD screens, or liquid crystal displays. These displays use red, green, and blue subpixels within each individual pixel to display a full range of colors. Since white light contains all wavelengths of visible light, red, green, and blue pixels are utilized in displaying a white screen. The water magnifies these subpixels and acts as a prism to show a variety of mixtures of colors, creating a rainbow effect.