The Rainbow printer effect occurs due to the principles of refraction, dispersion, and reflection of light in water droplets. As sunlight enters a droplet, it bends (refracts) due to the change in medium, then splits (disperses) into its component colors because different wavelengths travel at different speeds in water. The light then reflects internally and exits the droplet at a precise angle (~42° for a primary rainbow). When an irrigation sprinkler moves, it continuously introduces fresh dro