Why the rainbow is always formed in the shape of an arc?

Question

Why the rainbow is always formed in the shape of an arc?

Answer 1

because our earth is round

Answer 2

It is actually called refractory light.  Another examply of this would be, have you ever looked at a headlight with rain on your windshield, there appears to be a halo of light coming from the source, so in the same way, the rainbow that you see is being illuminated by the moisture in the air and yes they are full circles but you can only see one side because of the horizon.

Answer 3

Rainbows don't have "ends" but are full circled, but we can't see this because the horizon of the earth is in the way. The rainbow is circular because when a raindrop bends light, the light exits the raindrop at a 40-42 degree angle away from the angle it entered the raindrop.

Answer 4

the leprachuan desided it woud best seat his needs to find his pot of gold

Answer 5

sometimes when the cloud formation and moisture content is at the right hight above the earth and you look up towards the sun (and sometimes the moon) you can see a rainbow around the sun(or moon) it is full circle because this is the shape of the source of the light : round like the sun...