You Can Never Reach the End of a Rainbow
A rainbow is an optical illusion, not a physical object, formed by sunlight reflecting and refracting through water droplets. Its perceived location changes with your perspective, moving as you move.
Topic
Refraction
2 facts
Light Slows Down When Traveling Through Water or Glass
Light travels fastest in a vacuum (about 299,792 kilometers per second). When it passes through denser mediums like water or glass, it interacts with the atoms, causing it to slow down temporarily.