What cause's the curve in a Rainbow,?

Question

Also is it true that a Rainbow cannot be formed at noon in mid Summer because the Sun is directly overhead

Yep, i have seen a fully circular Rainbow from high up on a Mountain below me

Answer 1

The rainbow is formed by the refraction and reflection of the sun's rays as they fall on drops of rain which act as prism to produce the different colours.
The position of the sun,the rain drops and the observer count in producing the rainbow.The angle which the rain drop makes at the observer's eye is particularly important.
According to simple geometrical principles,the rain drops which lie at this angle and in a direction opposite to the sun, lie in the form of a full circle or part of it(arc).Even if there are enough raindrops to form a full circle,it will look like an arc as it is limited by the horizon.
If the observer is on a high mountain and the sun is near the horizon,he will be able to see the whole circle of rainbow.

Answer 2

Take a look at a halo around either the sun or moon, they are also a complete circle. Here is the definition of a rainbow: The arc of concentric prismatic bands that spans a section of the sky opposite the sun when rain is present and the sun is positioned at the observer's back. The sequence of colors is red (on the outside), yellow, green, blue, violet.

Answer 3

maybe because of the water present in the atmosphere, the light is bent and produces the colors of the rainbow and its shape...the atmosphere working as a prism.

Answer 4

If you see a rainbow from a plane, they're actually circular.

Answer 5

coz the world is round!

Answer 6

IT WAS ITS OWN CHARACTERISTICS.
LIKE US WE HAVE OUR OWN CHARACTERISTICS.
DID YOU NOT ATTEMPT TO ASK WHY WHERE NOT SLEEPING WHILE WALKING? WE'RE NOT SLEEPING WHILE WALKING BECAUSE THATS OUR OWN CHARACTERISTICS.