How big can a rainbow be?

Answer 1

One interesting fact about rainbows is this: they are totally individual. Your view of a rainbow is your view and although the same phenomenon can be seen by another person, their view is not exactly the same as your view.

So, a rainbow is as long as you can see it -- or view it -- to be.

You can read more, below.

Answer 2

Raindrops are formed when tiny droplets are enlarged, first by moisture from the surrounding air condensing on them and then by coalescing with other droplets during their descent. Raindrops vary in size from about 0.02 in. (0.5 mm) to as much as 0.33 in. (8 mm) in thunderstorms.
Raindrops come in many different sizes and can get to as big as a quarter inch. They cannot get bigger than that and the reason is that the wind resistance begins breaking them up into smaller raindrops.
Raindrops don't get much larger than a quarter inch.

Answer 3

A rainbow is a phenomenon in which a white light ray (usually from a sun) reflects and refracts off particles in the air (in this case water particles from rain) to produce a spectrum of colours (due to the refractive index differentiation in colours). However, the length of a rainbow depends on how many particles there are for light to refract off, the angle in which it reaches the eye, and any objects that obscure the view of the rainbow. So, the largest rainbow could be found at a certain height above the ground (where no objects can obscure the persons view), where the particles in the air are prominent enough to form a full rainbow but not enough to obscure the view of the rainbow by dispersion of light via reflection off other particles. So in terms of how big a rainbow can be, it depends on the variables that act upon it, but unfortunately a rainbow cannot be accurately measured because it is a phenomenon of light particles, and not a physical object.

Answer 4

A rainbow is an optical illusion and as such, has no measurable length. Even when a rainbow appears very far away, the image you see is much closer. If you try to move towards one end of the rainbow, it will 'move' away from you until the conditions no longer exist for the rainbow to appear. Think of the rainbow made by a sprinkler on a sunny day...

Answer 5

The number of rain drops that act like a prism through which the sunlight passes.

Answer 6

the size of a rainbow is dependant on the perspective of the observer.