Gälbågen

Gälbågen, also known as the rainbow, is a meteorological phenomenon caused by reflection, refraction, and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It typically appears in the sky after a rain shower, when the sun is at a low angle and the rain is falling in the opposite direction. The colors of the rainbow are red, orange, yellow, green, blue, indigo, and violet, which correspond to the different wavelengths of visible light.

The primary rainbow is the most commonly observed type, appearing as an arc with red on the outer part and violet on the inner side. A secondary rainbow can also form outside the primary rainbow, with the colors reversed and a darker band between the two arcs. This is due to a double reflection of light within the raindrops.

Rainbows can be full-circle arcs, but from the ground, they are usually seen as semicircular arcs. They can also appear as a full circle when viewed from an airplane or a high vantage point. The size and shape of the rainbow depend on the size of the water droplets and the angle of the sun.

Rainbows have been the subject of cultural and scientific interest for centuries. In mythology and folklore, rainbows are often associated with divine or magical phenomena. Scientifically, rainbows have been studied to understand the properties of light and the behavior of water droplets. They are also a popular subject in art and literature.