There is no "why" because the hypothesis of the question is false.
You absolutely can see the sun and a rainbow at the same time. In fact,
if the sun isn't there, in a patch of clear sky, then there can't be a rainbow.
Maybe the reason for your impression that you can't see them at the same time
is the simple fact that the sun and the rainbow are always in exactly opposite
directions from you, and so in order to see one of them, you must look away
from the other one.
Sunlight (white light) is split into the rainbow colours by passing through drops of rain in the sky.
No, different people may see slightly different rainbows depending on their viewing angle and distance from the rainbow. Each person's perspective will affect the portion of the rainbow they are able to see.
No, you do not always see a rainbow when it stops raining. For a rainbow to appear, the conditions must be right, such as sunlight and rain at the same time, with the sun at a low angle in the sky behind the observer.
Rainbows are odorless and tasteless, and they have no weight, mass, density, cost, temperature, viscosity, or tensile strength. To be perfectly honest, a rainbow is an optical illusion, visible only to you. Others may see a rainbow at the same time that you do, but nobody can see the same one that you see.
you cant make a rainbow in a bubble. but you can see one if the bubble is in front or near the sun. you must look at it a certain way in order to see colors!
I have seen 3 my friend up in northern Sweden claims 5.
Yes.
One doesn't have to be at any specific angle to see a rainbow. What is Dependent on seeing the rainbow is the location of the rain, and sun relative to you. The sun is always behind a rainbow when seen. So you would be in front of the rainbow, rain, and the sun. Also, No two people see the same rainbow unless a picture or video was taken of the rainbow.
No, a rainbow is not a living thing. In fact, it's not even a thing. A rainbow is the result of sunlight reflecting from the insides of droplets of rainwater. It's as real a thing as the picture of yourself that you see in a mirror, and no two people even see the same rainbow in the same place at the same time.
For a rainbow you need rain and sunshine at the same time. So this is possible on a partly cloudy day.
Red, Orange, Yellow, Blue, Green, Purple, and you can add pink if you want. The reason they go in order is because not every rainbow you see cant be a different color they are just all the same. The wave lengths effect the bending of the light.
Is it online...im not sure but i think you cant ..you can try and see.