system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If Rainbows are caused by light refracting through water droplets, why isn't the whole sky a rainbow when it's misty? Also, why does it "bow" and not stay straight?
gpt
Refraction means bending at a specific angle, not scattering in all directions. Sunlight only comes from one direction (the Sun). Imagine you take a beam of light and you have to bend it 5 degrees - no more, no less. You can bend it left, right, up, down, etc. Doing all at once, and you trace out a circle - the beam becomes a hollow cone. That's why rainbows are circles. And they're *rainbows* instead of just rings of sunlight since each wavelength (color) is bent at a slightly different angle.