Describe the accepted model of rainbows. Specifically, discuss how the model accounts for the size, shape, location, and color ordering of primary rainbows.

The accepted model of rainbows attributes their formation to the refraction and dispersion of sunlight interacting with water droplets. When white sunlight enters a water droplet, it is refracted, bent, and dispersed into its constituent colors. The geometry and size of rainbows are determined by the rainbow angle, with primary rainbows having an angle of approximately 42 degrees. The unique shape and location of rainbows as circular arcs in the sky centered around the anti-solar point result from the constant rainbow angle. The color ordering of primary rainbows, going from red on the outer edge to violet on the inner edge, is due to the dispersion of light and the varying bending of different wavelengths.